Statistics - Variance Estimation and Precision

Ribbon Bar. Select the Statistics tab. In the Advanced/Multivariate group, click Variance to display the Variance Estimation and Precision Startup Panel.

Classic menus. On the Statistics menu, select Variance Estimation and Precision to display the Variance Estimation and Precision Startup Panel.

Variance components are used in the context of experimental designs with random effects, to denote the estimate of the (amount of) variance that can be attributed to those effects. For example, if you are interested in the effect that the quality of different schools has on academic proficiency, you could select a sample of schools to estimate the amount of variance in academic proficiency (component of variance) that is attributable to differences between schools.

The Variance Estimation and Precision module provides a comprehensive set of techniques for analyzing research designs that include both fixed and random effects. You can obtain estimates of variance components and use those estimated variance components to make precision statements while at the same time comparing fixed effects in the presence of multiple sources of variation.

The Generalized Linear/Nonlinear Models (GLM) module will also compute variance components (based on denominator synthesis) of complex ANOVA/ANCOVA designs.