Factor analysis, path analysis, structural equation modeling, and related multivariate statistical methods are based on maximum likelihood or generalized least squares estimation developed for covariance structure models. Large-sample theory provides a chi-square goodness-of-fit test for comparing a model against a general alternative model based on correlated variables. This model comparison is insufficient for model evaluation: In large samples virtually any model tends to be rejected as inadequate, and in small samples various competing models, if evaluated, might be equally acceptable. A general null model based on modified independence among variables is proposed to provide an additional reference point for the statistical and scientific evaluation of covariance structure models. Use of the null model in the context of a procedure that sequentially evaluates the statistical necessity of various sets of parameters places statistical methods in covariance structure analysis into a more complete framework. The concepts of ideal models and pseudo chi-square tests are introduced, and their roles in hypothesis testing are developed. The importance of supplementing statistical evaluation with incremental fit indices associated with the comparison of hierarchical models is also emphasized. Normed and nonnormed fit indices are developed and illustrated.

Significance tests and goodness of fit in the analysis of covariance structures

Similarity breeds connection. This principle—the homophily principle—structures network ties of every type, including marriage, friendship, work, advice, support, information transfer, exchange, comembership, and other types of relationship. The result is that people's personal networks are homogeneous with regard to many sociodemographic, behavioral, and intrapersonal characteristics. Homophily limits people's social worlds in a way that has powerful implications for the information they receive, the attitudes they form, and the interactions they experience. Homophily in race and ethnicity creates the strongest divides in our personal environments, with age, religion, education, occupation, and gender following in roughly that order. Geographic propinquity, families, organizations, and isomorphic positions in social systems all create contexts in which homophilous relations form. Ties between nonsimilar individuals also dissolve at a higher rate, which sets the stage for the formation of niches (localize...

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Birds of a Feather: Homophily in Social Networks

This chapter suggests that delinquency conceals two distinct categories of individuals, each with a unique natural history and etiology: A small group engages in antisocial behavior of one sort or another at every life stage, whereas a larger group is antisocial only during adolescence. According to the theory of life-course-persistent antisocial behavior, children's neuropsychological problems interact cumulatively with their criminogenic environments across development, culminating m a pathological personality. According to the theory of adolescence-limited antisocial behavior, a contemporary maturity gap encourages teens to mimic antisocial behavior in ways that are normative and adjustive. There are marked individual differences in the stability of antisocial behavior. The chapter reviews the mysterious relationship between age and antisocial behavior. Some youths who refrain from antisocial behavior may, for some reason, not sense the maturity gap and therefore lack the hypothesized motivation for experimenting with crime.

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Adolescence-limited and life-course-persistent antisocial behavior: A developmental taxonomy.

How people intentionally change addictive behaviors with and without treatment is not well understood by behavioral scientists. This article summarizes research on self-initiated and professionally facilitated change of addictive behaviors using the key transtheoretical constructs of stages and processes of change. Modification of addictive behaviors involves progression through five stages—precontemplation, contemplation, preparation, action, and maintenance—and individuals typically recycle through these stages several times before termination of the addiction. Multiple studies provide strong support for these stages as well as for a finite and common set of change processes used to progress through the stages. Research to date supports a transtheoretical model of change that systematically integrates the stages with processes of change from diverse theories of psychotherapy.

http://cedd.org.au/wordpress/wp-content/uploads/2014/09/In-Search-of-How-People-Change-Applications-to-Addictive-Behaviours.pdf

In search of how people change: Applications to addictive behaviors.

This review collates and examines critically a theoretically convergent but widely dispersed body of research on the influence of external environments on the functioning of families as contexts of human development. Investigations falling within this expanding domain include studies of the interaction of genetics and environment in family processes; transitions and linkages between the family and other major settings influencing development, such as hospitals, day care, peer groups, school, social networks, the world of work (both for parents and children), and neighborhoods and communities; and public policies affecting families and children. A second major focus is on the patterning of environmental events and transitions over the life course as these affect and are affected by intrafamilial processes. Special emphasis is given to critical research gaps in knowledge and priorities for future investigation. The purpose of this article is to document and delineate promising lines of research on external influences that affect the capacity of families to foster the healthy development of their children. The focus differs from that of most studies of the family as a context of human development, because the majority have concentrated on intrafamilial processes of parent-child interaction, a fact that is reflected in Maccoby and Martin's (1983) recent authoritative review of research on family influences on development. By contrast, the focus of the present analysis can be described as "once removed." The research question becomes: How are intrafamilial processes affected by extrafamilial conditions? Paradigm Parameters In tracing the evolution of research models in developmental science, Bronfenbrenner and Crouter (1983) distinguished a series of progressively more sophisticated scientific paradigms for investigating the impact of environment on development. These paradigms provide a useful framework for ordering and analyzing studies bearing on the topic of this review. At the most general level, the research models vary simultaneously along two dimensions. As applied to the subject at hand, the first pertains

http://rinaldipsych.synthasite.com/resources/Bronfenbrenner.pdf

Ecology of the family as a context for human development: research perspectives

Longitudinal sociometric data on adolescent friendship pairs, friends-to-be, and former friends are examined to assess levels of homophily on four attributes (frequency of current marijuana, use, level of educational aspirations, political orientation, and participation in minor delinquency) at various stages of friendship formation and dissolution. In addition, estimates are developed of the extent to which observed homophily in friendship dyads results from a process of selection (assortative pairing), in which similarity precedes association and the extent to which it results from a process of socialization in which association leads to similarity. The implications of the results for interpreting estimates of peer influence derived from cross-sectional data are discussed.

Homophily, Selection, and Socialization in Adolescent Friendships

Two longitudinal surveys based on random samples of high school students in New York State indicate four stages in the sequence of involvement with drugs: beer or wine, or both; cigarettes or hard liquor; marihuana; and other illicit drugs. The legal drugs are necessary intermediates between nonuse and marihuana. Whereas 27 percent of high school students who smoke and drink progress to marihuana within a 5- to 6-month follow-up period, only 2 percent of those who have not used any legal substance do so. Marihuana, in turn, is a crucial step on the way to other illicit drugs. While 26 percent of marihuana users progress to LSD, amphetamines, or heroin, only 1 percent of nondrug marihuana users and 4 percent of legal drug users do so. This sequence is found in each of the 4 years in high school and in the year after graduation. The reverse sequence holds for regression in drug use.

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Stages in adolescent involvement in drug use

Sequential stages of involvement in alcohol and/or cigarettes, marijuana, other illicit drugs and medically prescribed psychoactive drugs from adolescence to adulthood are investigated in a longitudinal cohort that has been followed from ages 15 to 35. Alternative models of progression are tested for their goodness of fit. Four stages are identified: that of legal drugs, alcohol or cigarettes; marijuana; illicit drugs other than marijuana; and medically prescribed drugs. Whereas progression to illicit drugs among men is dependent upon prior use of alcohol, among women either cigarettes or alcohol is a sufficient condition for progression to marijuana. Age of onset and frequency of use at a lower stage of drug use are strong predictors of further progression.

Stages of progression in drug involvement from adolescence to adulthood: further evidence for the gateway theory.

The epidemiology and correlates of depressive mood were measured in a representative sample of public high school students in New York State and a subsample matched to their parents. Depressive mood was measured by a self-reported scale validated in a clinical sample. Adolescents with a diagnosis of major depressive disorder scored higher than those with other psychiatric diagnoses. In the general adolescent sample, ex differences in depressive mood paralleled those previously reported for adults, with girls scoring higher than boys. Adolescents reported higher depressive mood than their parents, with the differences greater in daughter-mother than in son-father pairs. If judged by mood differences, adolescence was a stressful period in the life cycle. Lowest levels of adolescent depressive mood correlated with high levels of attachment both to parents and to peers. Sex differences in depressive mood in adolescents may be accounted for by masked depression and increased delinquency among boys as compared with girls.

https://jamanetwork.com/HttpHandlers/ArticlePdfHandler.ashx?journal=PSYCH&articleId=492893&pdfFileName=archpsyc_39_10_011.pdf

Epidemiology of Depressive Mood in Adolescents: An Empirical Study

OBJECTIVES This study sought to describe patterns of initiation, persistence, and cessation in drug use in individuals from their late 20s to their mid-30s, within a broad perspective that spans 19 years from adolescence to adulthood METHODS A fourth wave of personal interviews was conducted at ages 34-35 with a cohort of men and women (n = 1160) representative of adolescents formerly enrolled in New York State public secondary high schools A school survey was administered at ages 15-16, and personal interviews with participants and school absentees were conducted at ages 24-25 and 28-29 Retrospective continuous histories of 12 drug classes were obtained at each follow-up RESULTS There was no initiation into alcohol and cigarettes and hardly any initiation into illicit drugs after age 29, the age at which most use ceased The largest proportion of new users was observed for prescribed psychoactives Periods of highest use since adolescence based on relative and absolute criteria were delineated Am

Denise B. Kandel

Papers

Homophily, Selection, and Socialization in Adolescent Friendships

Stages in adolescent involvement in drug use

Stages of progression in drug involvement from adolescence to adulthood: further evidence for the gateway theory.

Epidemiology of Depressive Mood in Adolescents: An Empirical Study

The natural history of drug use from adolescence to the mid-thirties in a general population sample.