Effect sizes have been increasingly emphasized in research as more researchers have recognized that: (1) all parametric analyses (t-tests, analyses of variance, etc.) are correlational; (2) effect sizes have played an important role in meta-analytic work; and (3) statistical significance testing is limited in its capacity to inform scientific…

Latent trait measurement theory was used to investigate the measurement characteristics of both parts of a multiple-choice measure of field-independence, the Finding Embedded Figures Test (FEFT). Analysis was based on data provided by 1,528 students enrolled in one of two middle schools located in the southern United States. Of the subjects, 731…