Tuesday, January 5, 2021

ANCOVA in Counseling & Behavioral Research



ANCOVA is a procedure like ANOVA except researchers can study the effects of one or more independent variables on a dependent variable after adjusting for other variables, called covariates, which were not a primary focus of the study. The letter C in ANCOVA stands for covariate. There can be several covariates in a study. In testing for differences among groups experiencing different leadership styles, we could study the effects on employee satisfaction after adjusting for a covariate of years of employment. A key word in ANCOVA studies is adjusting. Analysts adjust the scores based on information about the covariate before testing for significant differences.

Basic features of an ANCOVA:

Independent or grouping Variable = 1 or more

Dependent or criterion Variable = 1

Covariates = 1 or more

An test indicates significance overall and for specific effects or relationships.

A commonly reported measure of effect size is eta squared.

value reveals the probability of a significant relationship-- one that is not due to chance factors.

Read more about ANCOVA in the following books.

Applied Statistics Concepts for Counselors on AMAZON or GOOGLE

Creating Surveys on AMAZON    or   GOOGLE  Worldwide

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