Showing papers by "Tilburg University published in 2015"

Estimating the reproducibility of psychological science

Abstract: Reproducibility is a defining feature of science, but the extent to which it characterizes current research is unknown. We conducted replications of 100 experimental and correlational studies published in three psychology journals using high-powered designs and original materials when available. Replication effects were half the magnitude of original effects, representing a substantial decline. Ninety-seven percent of original studies had statistically significant results. Thirty-six percent of replications had statistically significant results; 47% of original effect sizes were in the 95% confidence interval of the replication effect size; 39% of effects were subjectively rated to have replicated the original result; and if no bias in original results is assumed, combining original and replication results left 68% with statistically significant effects. Correlational tests suggest that replication success was better predicted by the strength of original evidence than by characteristics of the original and replication teams.

Age of Transfused Blood in Critically Ill Adults

Abstract: BackgroundFresh red cells may improve outcomes in critically ill patients by enhancing oxygen delivery while minimizing the risks of toxic effects from cellular changes and the accumulation of bioactive materials in blood components during prolonged storage. MethodsIn this multicenter, randomized, blinded trial, we assigned critically ill adults to receive either red cells that had been stored for less than 8 days or standard-issue red cells (the oldest compatible units available in the blood bank). The primary outcome measure was 90-day mortality. ResultsBetween March 2009 and May 2014, at 64 centers in Canada and Europe, 1211 patients were assigned to receive fresh red cells (fresh-blood group) and 1219 patients were assigned to receive standard-issue red cells (standard-blood group). Red cells were stored a mean (±SD) of 6.1±4.9 days in the fresh-blood group as compared with 22.0±8.4 days in the standard-blood group (P<0.001). At 90 days, 448 patients (37.0%) in the fresh-blood group and 430 patients (...

A practical guide to robust optimization

Abstract: Robust optimization is a young and active research field that has been mainly developed in the last 15 years. Robust optimization is very useful for practice, since it is tailored to the information at hand, and it leads to computationally tractable formulations. It is therefore remarkable that real-life applications of robust optimization are still lagging behind; there is much more potential for real-life applications than has been exploited hitherto. The aim of this paper is to help practitioners to understand robust optimization and to successfully apply it in practice. We provide a brief introduction to robust optimization, and also describe important do׳s and don׳ts for using it in practice. We use many small examples to illustrate our discussions.

A Meta-Analytic Review of Moral Licensing

Abstract: Moral licensing refers to the effect that when people initially behave in a moral way, they are later more likely to display behaviors that are immoral, unethical, or otherwise problematic. We provide a state-of-the-art overview of moral licensing by conducting a meta-analysis of 91 studies (7,397 participants) that compare a licensing condition with a control condition. Based on this analysis, the magnitude of the moral licensing effect is estimated to be a Cohen’s d of 0.31. We tested potential moderators and found that published studies tend to have larger moral licensing effects than unpublished studies. We found no empirical evidence for other moderators that were theorized to be of importance. The effect size estimate implies that studies require many more participants to draw solid conclusions about moral licensing and its possible moderators.

The Ordinal Effects of Ostracism: A Meta-Analysis of 120 Cyberball Studies

Abstract: We examined 120 Cyberball studies (N = 11,869) to determine the effect size of ostracism and conditions under which the effect may be reversed, eliminated, or small. Our analyses showed that (1) the average ostracism effect is large (d > |1.4|) and (2) generalizes across structural aspects (number of players, ostracism duration, number of tosses, type of needs scale), sampling aspects (gender, age, country), and types of dependent measure (interpersonal, intrapersonal, fundamental needs). Further, we test Williams’s (2009) proposition that the immediate impact of ostracism is resistant to moderation, but that moderation is more likely to be observed in delayed measures. Our findings suggest that (3) both first and last measures are susceptible to moderation and (4) time passed since being ostracized does not predict effect sizes of the last measure. Thus, support for this proposition is tenuous and we suggest modifications to the temporal need-threat model of ostracism.

Risk of Postpartum Relapse in Bipolar Disorder and Postpartum Psychosis: A Systematic Review and Meta-Analysis.

Abstract: Objective:Women with a history of bipolar disorder, postpartum psychosis, or both are at high risk for postpartum relapse. The aim of this meta-analysis was to estimate the risk of postpartum relapse in these three patient groups.Method:A systematic literature search was conducted in all public medical electronic databases, adhering to the PRISMA guidelines. Studies were included if they reported postpartum relapse in patients diagnosed with bipolar disorder and/or a history of postpartum psychosis or mania according to DSM or ICD criteria or the Research Diagnostic Criteria.Results:Thirty-seven articles describing 5,700 deliveries in 4,023 patients were included in the quantitative analyses. The overall postpartum relapse risk was 35% (95% CI=29, 41). Patients with bipolar disorder were significantly less likely to experience severe episodes postpartum (17%, 95% CI=13, 21) than patients with a history of postpartum psychosis (29%, 95% CI=20, 41). Insufficient information was available to determine relaps...

Dyadic coping and relationship functioning in couples coping with cancer: a systematic review.

Abstract: Objectives Cancer not only affects the patient but also the partner. In fact, couples may react as a unit rather than as individuals while coping with cancer (i.e., dyadic coping). We assessed (1) the relationship between dyadic coping and relationship functioning in couples coping with cancer and (2) whether intervention studies aimed at improving dyadic coping were able to enhance the relationship functioning of these couples. Recommendations for future studies are provided. Method A systematic search was conducted to identify all eligible papers between January 1990 and September 2012. The databases PubMed, PsycINFO, the Cochrane Library, and EMBASE were screened. Results Most studies (n = 33) used an appropriate study design, adequate measurements, adequate analytical techniques, and a sufficient number of included participants to answer addressed research questions. However, the definition and assessment of dyadic coping strategies differed, which hampered comparison. Coping styles characterized by open and constructive (cancer-related) communication, supportive behaviours, positive dyadic coping, and joint problem solving were related to higher relationship functioning, whereas dysfunctional communication patterns (e.g., protective buffering, demand–withdraw communication), unsupportive behaviours, and negative dyadic coping were related to lower relationship functioning. The results of the intervention studies were inconsistent: while some studies reported a beneficial effect on relationship functioning, other studies report no such effect, or only found a positive effect in couples with fewer personal relationship resources. Conclusions This review showed that adequate dyadic coping may improve relationship functioning, while dysfunctional dyadic coping may impede relationship functioning. In order to increase the comparability of the reported findings, a more uniformly conceptualized perspective on dyadic coping is needed. A better understanding of the dyadic challenges couples coping with cancer may face and more insight on how to expand the dyadic coping of these coupes might facilitate improvements in the quality of cancer care. Couple-based intervention studies may increase the couples’ relationship functioning. However, future research is needed to examine more specifically which couples may benefit from such interventions. Statement of contribution What is already known on this subject? Dyadic coping may influence the distress experienced by both members of the couple and their relationship functioning. Several reviews already reported on the potential of couple-based interventions to improve the dyadic coping of couples coping with cancer and on the beneficial effects of this coping on the psychosocial adjustment and relationship functioning of patients and partners (e.g., Badr & Krebs, 2012; Martire, Shulz, Helgeson, Small, & Saghafi, 2010; Regan et al., 2012). However, even though we now know that couple-based intervention might be useful, no systematic review has been conducted that focuses specifically on the mechanisms of dyadic coping itself. What does this study add? This review showed the importance of stress communication, supportive behaviours, and positive dyadic coping for the maintenance or enhancement of relationship functioning in couples coping with cancer. In addition, the dyadic intervention studies send an important message that encourages to further examine the potential benefit of such interventions in future. However, more consensus in the conceptualization and assessment of the dyadic coping styles is needed in order to increase the comparability of the reported findings.

Predictors of treatment dropout in self-guided web-based interventions for depression: an 'individual patient data' meta-analysis

Abstract: Background It is well known that web-based interventions can be effective treatments for depression. However, dropout rates in web-based interventions are typically high, especially in self-guided web-based interventions. Rigorous empirical evidence regarding factors influencing dropout in self-guided web-based interventions is lacking due to small study sample sizes. In this paper we examined predictors of dropout in an individual patient data meta-analysis to gain a better understanding of who may benefit from these interventions. Method A comprehensive literature search for all randomized controlled trials (RCTs) of psychotherapy for adults with depression from 2006 to January 2013 was conducted. Next, we approached authors to collect the primary data of the selected studies. Predictors of dropout, such as socio-demographic, clinical, and intervention characteristics were examined. Results Data from 2705 participants across ten RCTs of self-guided web-based interventions for depression were analysed. The multivariate analysis indicated that male gender [relative risk (RR) 1.08], lower educational level (primary education, RR 1.26) and co-morbid anxiety symptoms (RR 1.18) significantly increased the risk of dropping out, while for every additional 4 years of age, the risk of dropping out significantly decreased (RR 0.94). Conclusions Dropout can be predicted by several variables and is not randomly distributed. This knowledge may inform tailoring of online self-help interventions to prevent dropout in identified groups at risk.

The role of employee HR attributions in the relationship between high‐performance work systems and employee outcomes

Abstract: Although research has shown that the use of high-performance work systems (HPWS) is associated with employee outcomes, our knowledge of the meanings employees attach to HPWS systems and how these shape employee outcomes is still limited. This study examines the signalling impact of enacted HPWS on HR well-being and HR performance attributions, and how these influence happiness- and health-related outcomes. Using multilevel data (1,065 employees nested within 150 work units) obtained from multiple sources (line managers and employees), our results show that coverage of HPWS was positively associated with the two HR attributions. In addition, HR well-being attributions were associated with higher levels of commitment and lower levels of job strain. HR performance attributions were associated with higher levels of job strain. The findings of this study highlight the importance of taking into account how employees attach meaning to enacted HPWS in order to predict employee outcomes.

Combining structure, governance and context: A configurational approach to network effectiveness

Abstract: This study explores the way in which network structure (network integration), network context (resource munificence and stability), and network governance mode relate to net -work effectiveness. The model by Provan and Milward (Provan, Keith G., and H. Brinton Milward. 1995. A preliminary theory of interorganizational network effectiveness: A comparative study of four community mental health systems. Administrative Science Quarterly 40 (1):1–33) on the effectiveness of designed and goal-directed interorganizational networks is extended and tested on the basis of 39 crime prevention networks (Safety Houses) in the Netherlands. Ten cases were subjected to in-depth analysis through documentation reviews, interviews, observations, and a survey among network participants. In the other 29 cases semistructured interviews were conducted with the network managers. The data for all 39 cases were analyzed with crisp-set Qualitative Comparative Analysis. The results revealed two different configurations for network effectiveness. Effective networks are centrally integrated networks that have been in existence for at least 3 years (age) and which show a high degree of stability. In addition, they either have considerable resources at their disposal or they have been set up with a network administrative organization. The results confirm core insights from Provan and Milward’s earlier study but also show that administrative resources can serve as a substitute for financial resources (and vice versa). The article concludes with suggestions for the further development of a configurational theory of network effectiveness.

Understanding hybridity in public organizations

Abstract: This article explores and extends the concept of hybridity to understand current changes in public services organizations, notably as seen from an organizational studies perspective. The notion of hybridity has become more important, given that the public sector increasingly blurs with other sectors and more social actors. Previous reliance on the use of ideal-types in characterizing public services reforms has masked expanding heterogeneity. We here move beyond the (i) conventional focus on structural hybridity to consider (ii) institutional dynamics, (iii) social interactions, and (iv) new identities and roles in public services. Based on these four dimensions of hybridity, we review alternative theoretical frameworks. We suggest that bringing together work from the neighbouring disciplines of public administration and organization studies may improve our understanding of public services hybridity and outline a future research agenda.

Regression and Kriging Metamodels with Their Experimental Designs in Simulation: Review

Abstract: This article reviews the design and analysis of simulation experiments. It focusses on analysis via either low-order polynomial regression or Kriging (also known as Gaussian process) metamodels. The type of metamodel determines the design of the experiment, which determines the input combinations of the simulation experiment. For example, a first-order polynomial metamodel requires a "resolution-III" design, whereas Kriging may use Latin hypercube sampling. Polynomials of first or second order require resolution III, IV, V, or "central composite" designs. Before applying either regression or Kriging, sequential bifurcation may be applied to screen a great many inputs. Optimization of the simulated system may use either a sequence of low-order polynomials known as response surface methodology (RSM) or Kriging models fitted through sequential designs including efficient global optimization (EGO). The review includes robust optimization, which accounts for uncertain simulation inputs.

Financial literacy and the demand for financial advice

Abstract: The low level of financial literacy across households suggests that they are at risk of making suboptimal financial decisions. In this paper, we analyze the effect of investors’ financial literacy on their decision to demand professional, non-independent advice. We find that non-independent advisors are not sufficient to alleviate the problem of low financial literacy. The investors with a low level of financial literacy are less likely to consult an advisor, but they delegate their portfolio choice more often or do not invest in risky assets at all. We explain this evidence with a highly stylized model of strategic interaction between investors and better informed advisors with conflicts of interests. The advisors provide more information to knowledgeable investors, who anticipating this are more likely to consult them.

Meta-analysis using effect size distributions of only statistically significant studies.

Abstract: Publication bias threatens the validity of meta-analytic results and leads to overestimation of the effect size in traditional meta-analysis. This particularly applies to meta-analyses that feature small studies, which are ubiquitous in psychology. Here we develop a new method for meta-analysis that deals with publication bias. This method, p-uniform, enables (a) testing of publication bias, (b) effect size estimation, and (c) testing of the null-hypothesis of no effect. No current method for meta-analysis possesses all 3 qualities. Application of p-uniform is straightforward because no additional data on missing studies are needed and no sophisticated assumptions or choices need to be made before applying it. Simulations show that p-uniform generally outperforms the trim-and-fill method and the test of excess significance (TES; Ioannidis & Trikalinos, 2007b) if publication bias exists and population effect size is homogenous or heterogeneity is slight. For illustration, p-uniform and other publication bias analyses are applied to the meta-analysis of McCall and Carriger (1993) examining the association between infants' habituation to a stimulus and their later cognitive ability (IQ). We conclude that p-uniform is a valuable technique for examining publication bias and estimating population effects in fixed-effect meta-analyses, and as sensitivity analysis to draw inferences about publication bias.

Cultural intelligence: A theory-based, short form measure

Abstract: This article reports the development and validation of a theory-based, short form measure of cultural intelligence (SFCQ). The SFCQ captures the original theoretical intent of a multifaceted culture general form of intelligence that is related to effective intercultural interactions. The validity of the scale is established with 3526 participants in five language groups from around the world. Results provide evidence for construct and criterion-related validity of the measure, and indicate that cultural intelligence is a single latent factor reflected in three intermediate facets. In support of construct validity the measure is modestly related to but distinct from emotional intelligence and personality and correlates positively with several indicators of multicultural experience. With regard to criterion-related validity, it relates as predicted to several dimensions of intercultural effectiveness. Implications for the measurement and understanding of culture and the influence of culture on management practice are discussed.

Geographically varying associations between personality and life satisfaction in the London metropolitan area

Abstract: Residential location is thought to influence people’s well-being, but different individuals may value residential areas differently. We examined how life satisfaction and personality traits are geographically distributed within the UK London metropolitan area, and how the strength of associations between personality traits and life satisfaction vary by residential location (i.e., personality–neighborhood interactions). Residential area was recorded at the level of postal districts (216 districts, n = 56,019 participants). Results indicated that the strength of associations between personality traits and life satisfaction depended on neighborhood characteristics. Higher openness to experience was more positively associated with life satisfaction in postal districts characterized by higher average openness to experience, population density, and ethnic diversity. Higher agreeableness and conscientiousness were more strongly associated with life satisfaction in postal districts with lower overall levels of life satisfaction. The associations of extraversion and emotional stability were not modified by neighborhood characteristics. These findings suggest that people’s life satisfaction depends, in part, on the interaction between individual personality and particular features of the places they live.

An anatomy of state control in the globalization of state-owned enterprises

Abstract: Integrating agency theory with institutional analysis in international business, we propose a state-control perspective to analyze government-control mechanisms in emerging economies’ globalization of state-owned enterprises (SOEs). We identify two types of state control that influence SOEs’ globalization decisions and the degree of globalization (DOG): state ownership control and executives’ political connections, both of which are contingent upon the home country’s evolving institutional environments. Using a two-step corporate globalization decision model and 17,272 firm – year observations of non-financial, Chinese-listed companies, we find a strong impact of both types of state control on SOEs’ globalization, although the impacts differ between the periods before and after domestic governance reform and across different globalization decision steps. The diminishing impact of executives’ political connections and the increasing impact of state ownership control on firms’ DOG demonstrate the evolving relationship between the state and the managers, as well as the dynamics of state control in globalizing SOEs.

Towards a taxonomy for integrated care: a mixed-methods study

Abstract: Introduction: Building integrated services in a primary care setting is considered an essential important strategy for establishing a high-quality and affordable health care system. The theoretical foundations of such integrated service models are described by the Rainbow Model of Integrated Care, which distinguishes six integration dimensions (clinical, professional, organisational, system, functional and normative integration). The aim of the present study is to refine the Rainbow Model of Integrated Care by developing a taxonomy that specifies the underlying key features of the six dimensions. Methods: First, a literature review was conducted to identify features for achieving integrated service delivery. Second, a thematic analysis method was used to develop a taxonomy of key features organised into the dimensions of the Rainbow Model of Integrated Care. Finally, the appropriateness of the key features was tested in a Delphi study among Dutch experts. Results: The taxonomy consists of 59 key features distributed across the six integration dimensions of the Rainbow Model of Integrated Care. Key features associated with the clinical, professional, organisational and normative dimensions were considered appropriate by the experts. Key features linked to the functional and system dimensions were considered less appropriate. Discussion: This study contributes to the ongoing debate of defining the concept and typology of integrated care. This taxonomy provides a development agenda for establishing an accepted scientific framework of integrated care from an end-user, professional, managerial and policy perspective.

Deriving robust counterparts of nonlinear uncertain inequalities

Abstract: In this paper we provide a systematic way to construct the robust counterpart of a nonlinear uncertain inequality that is concave in the uncertain parameters. We use convex analysis (support functions, conjugate functions, Fenchel duality) and conic duality in order to convert the robust counterpart into an explicit and computationally tractable set of constraints. It turns out that to do so one has to calculate the support function of the uncertainty set and the concave conjugate of the nonlinear constraint function. Conveniently, these two computations are completely independent. This approach has several advantages. First, it provides an easy structured way to construct the robust counterpart both for linear and nonlinear inequalities. Second, it shows that for new classes of uncertainty regions and for new classes of nonlinear optimization problems tractable counterparts can be derived. We also study some cases where the inequality is nonconcave in the uncertain parameters.

Taxes and Financial Constraints: Evidence from Linguistic Cues

Abstract: Using a new measure of financial constraints based on firms’ qualitative disclosures, we find that financially constrained firms—firms that use more negative words in their annual reports—pursue more aggressive tax planning strategies as evidenced by: (1) higher current and future unrecognized tax benefits, (2) lower short- and long-run current and future effective tax rates, (3) increase in tax haven usage for their material operations, and (4) higher proposed audit adjustments from the Internal Revenue Service. We exploit the unexpected closures of local banks as exogenous liquidity shocks to show that firms’ external financial constraints affect their tax avoidance strategies. Overall, the linguistic cues in firms’ qualitative disclosures provide incremental information beyond traditional accounting variables or commonly used effective tax rates to reveal and predict tax aggressiveness, both contemporaneously and in the future.

I need time!: Exploring pathways to compliance under institutional complexity

Abstract: In this study, we examined responses to institutional complexity by analyzing when and how organizations respond to a coercive institutional demand from a powerful constituent when other important constituents do not accept the demand as legitimate. We experimentally manipulated institutional complexity and gauged the time to compliance of 100 childcare managers in the Netherlands, and then asked them to describe and explain their anticipated responses to multiple pressures. We found that institutional complexity leads decision makers to delay compliance, but usually not passively: decision makers used the time before compliance to attempt to reduce institutional complexity by neutralizing opposing pressures, challenging the coercive pressure, adapting the practice to suit opponents and their own personal beliefs, and/or waiting to see how the situation would unfold as multiple parties influenced one another. We found two factors influenced decision makers' choice of responses: (1) their interpretation of institutional complexity and (2) their personal beliefs toward the practice itself. Our findings contribute to an emerging understanding of how decision makers interpret and respond to institutional complexity, and thus complement recent studies in the institutional complexity literature

The benefits of simply observing: mindful attention modulates the link between motivation and behavior.

Abstract: Mindful attention, a central component of mindfulness meditation, can be conceived as becoming aware of one’s thoughts and experiences and being able to observe them as transient mental events. Here, we present a series of studies demonstrating the effects of applying this metacognitive perspective to one’s spontaneous reward responses when encountering attractive stimuli. Taking a grounded cognition perspective, we argue that reward simulations in response to attractive stimuli contribute to appetitive behavior and that motivational states and traits enhance these simulations. Directing mindful attention at these thoughts and seeing them as mere mental events should break this link, such that motivational states and traits no longer affect reward simulations and appetitive behavior. To test this account, we trained participants to observe their thoughts in reaction to appetitive stimuli as mental events, using a brief procedure designed for nonmeditators. Across 3 experiments, we found that adopting the mindful attention perspective reduced the effects of motivational states and traits on appetitive behavior in 2 domains, in both the laboratory and the field. Specifically, after applying mindful attention, participants’ sexual motivation no longer made opposite-sex others seem more attractive and thus desirable as partners. Similarly, participants’ levels of hunger no longer boosted the attractiveness of unhealthy foods, resulting in healthier eating choices. We discuss these results in the context of mechanisms and applications of mindful attention and explore how mindfulness and mindful attention can be conceptualized in psychological research more generally.

Peer Influence, Peer Status, and Prosocial Behavior: An Experimental Investigation of Peer Socialization of Adolescents' Intentions to Volunteer.

Abstract: Peer influence processes have been documented extensively for a wide range of maladaptive adolescent behaviors. However, peer socialization is not inherently deleterious, and little is known about whether adolescents influence each other's prosocial behaviors, or whether some peers are more influential than others towards positive youth outcomes. This study addressed these questions using an experimental "chat room" paradigm to examine in vivo peer influence of prosocial behavior endorsement. A school-based sample of 304 early adolescents (55% female, 45% male; M(age) = 12.68) believed they were interacting electronically with same-gender grademates (i.e., "e-confederates"), whose peer status was experimentally manipulated. The participants' intent to engage in prosocial behaviors was measured pre-experiment and in subsequent "public" and "private" experimental sessions. Overall, the adolescents conformed to the e-confederates' prosocial responses in public; yet, these peer influence effects were moderated by the peer status of the e-confederates, such that youth more strongly conformed to the high-status e-confederates than to the low-status ones. There also was some evidence that these peer influence effects were maintained in the private session, indicating potential internalization of prosocial peer norms. These findings help bridge the positive youth development and peer influence literatures, with potential implications for campaigns to increase prosocial behaviors.