selection model

a two-stage regression analysis used to estimate parameters and standard errors in an unbiased way when scores for one aspect of the sample may be affected by a nonrandom selection process. An example of data that could be appropriate for this method is women’s salaries: Some aspects of the data could be modeled using standard regression methods, but the preponderance of zero salaries (reflecting a decision by some women not to work) would also need to be incorporated into the analysis. See also truncated distribution.

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Psychology term of the day

May 9th 2024

hierarchically nested design

any research design that involves several levels of sampling, such that the entities on the lower levels of the design are nested or subsumed within higher order groups. For example, a hierarchically nested design for an educational study might involve students (A), who are nested within classrooms (B), which are nested within schools (C), which are further nested within school districts (D). Several statistical procedures (e.g., analysis of variance, regression analysis, hierarchical linear models) also incorporate a hierarchical aspect. Also called hierarchical design; nested design.