Date created: | Last Updated:

Category: Project

Description: Person judgment studies require adequate sampling of both the targets of the judgments (K) and those who judge them (N). Despite person judgment studies being appraised in terms of both the size of N and K, there has been little research looking for the ‘right’ number of targets. The current study uses two datasets to investigate the effect of increasing K. Sample One studies judges’ (N=193) ratings of the threat posed by point light targets (K=23) and Sample Two investigates the accuracy of (N=792) judges’ Big Five judgments from targets’ (K=50) self-selected photographs. Accuracy values were created from randomly selected subsets of targets of increasing number (k=3, k=4, etc). Our results show that accuracy values stabilise at k≈10. We find evidence that effect sizes of sample performance increase with greater K. The results encourage, but do not mandate, as large as K as possible.