Q2. How can the authors assess the reliability of a particular finding?
To assess the reliability of a particular finding, and the characteristics of studies that are associated with stronger, weaker, or reversed effects, a study must be repeated across many contexts using comparable measures and analytic procedures.
Q3. What measures of support for social change were likely to produce larger positive correlations?
Many of the largest positive correlations between intergroup contact and support for social change include the ‘working in solidarity’ measure.
Q4. What is the role of intergroup contact in reducing prejudice?
Evidence gathered over several decades shows that intergroup contact can reduce prejudice and increase social cohesion across group divides3,4.
Q5. How did the authors estimate the correlation between contact and social change?
To estimate therelation between contact and support for social change, the authors calculated bivariate correlations after removing the sample means from the data via residualization (which is comparable to a multilevel analysis with random intercepts).
Q6. What is the role of intergroup contact in promoting social change?
The potential for contact to both promote and undermine support for social change highlights the need for research elucidating when, for whom, and in what contexts intergroup contact predicts people’s willingness to advocate and take action for social equality.
Q7. What measures were used to assess the relationship between contact and social change?
The authors used specification curve analysis23 to probe the variation in the direction and magnitude of the association between contact and social change using every combination of available measures (see Supplementary Figure 3).
Q8. How did the authors estimate the association between contact and social change?
Heeding calls for more collaborative, high-powered, transparent, and reproducibleresearch processes19, the authors test the association between contact and support for social change using a large and heterogeneous dataset, sampling 12,997 participants from 69 countries and four populations (ethnic majorities, cis-heterosexuals, ethnic minorities, and LGBTIQ+ individuals; see Supplementary Tables 1-3 for more details).
Q9. What is the relationship between social change and the ability to work in solidarity?
Among advantaged groups, willingness to work in solidarity might reflect a recognition that social change is the responsibility of many in the larger society as a whole, rather than a burden to be carried solely by members of disadvantaged groups29,30.
Q10. What is the smallest possible p-value with 1,000 reshuffled samples?
The smallest possible p-value with 1,000 reshuffled samples is p < 1/1,000.Supplementary InformationSupplementary Materials: Supplementary Materials and Methods, Supplementary Figures 1-5, Supplementary Tables 1- 13, Supplementary References.
Q11. What measures produced larger positive correlations among disadvantaged groups?
By contrast, positive correlations were almost exclusively produced by model specifications including ‘working in solidarity’ as the measure of support for social change.