Home > Publications . Search All . Browse All . Country . Browse PSC Pubs . PSC Report Series

PSC In The News

RSS Feed icon

Sastry's 10-year study of New Orleans Katrina evacuees shows demographic differences between returning and nonreturning

Stafford says less educated, smaller investors more likely to sell off stock and lock in losses during market downturn

Chen says job fit, job happiness can be achieved over time

Highlights

Deirdre Bloome wins ASA award for work on racial inequality and intergenerational transmission

Bob Willis awarded 2015 Jacob Mincer Award for Lifetime Contributions to the Field of Labor Economics

David Lam is new director of Institute for Social Research

Elizabeth Bruch wins Robert Merton Prize for paper in analytic sociology

Next Brown Bag

Monday, Oct 12
Joe Grengs, Policy & Planning for Social Equity in Transportation

Sample size for cognitive interview pretesting

Publication Abstract

Blair, J., and Frederick G. Conrad. 2011. "Sample size for cognitive interview pretesting." Public Opinion Quarterly, 75(4): 636-658.

Every cognitive interview pretest designer must decide how many interviews need to be conducted. With little theory or empirical research to guide the choice of sample size, practitioners generally rely on the examples of other studies and their own experience or preferences. We investigated pretest sample size both theoretically and empirically. Using a model of the relationship of sample size to question problem prevalence, detection power of the cognitive interview technique, and probability of observing a problem, we computed the sample size necessary, under varying conditions, to detect problems. Under a range of plausible values for the model parameters, we found that additional problems continued to be detected as sample size increased. We also report on an empirical study that simulated the number of problems detected at different sample sizes. Multiple outcome measures showed a strong positive relationship between sample size and problem detection; serious problems that were not detected in small samples were consistently observed in larger samples. We discuss the implications of these findings for practice and for additional research.

DOI:10.1093/poq/nfr035 (Full Text)

Country of focus: United States of America.

Browse | Search : All Pubs | Next