What is meant by the term Covariables?

covariable (not comparable) (statistics) Possibly predictive of the outcome under study.

What are examples of covariates?

Another example (from Penn State): Let’s say you are comparing the salaries of men and women to see who earns more. One factor that you need to control for is that people tend to earn more the longer they are out of college. Years out of college in this case is a covariate.

What are covariates in psychology?

n. a variable that exhibits covariation with a measured outcome or dependent variable: It is often included in an analysis so that its effect may be taken into account when interpreting the effects of the independent variables of interest.

What is a covariate in regression?

However, occasionally there may be other variables that can affect the response variable that are not of interest to researchers. These variables are known as covariates. Covariates: Variables that affect a response variable, but are not of interest in a study.

What is another word for covariate?

In statistics, a covariate is a variable that is possibly predictive of the outcome under study. A covariate may be of direct interest or it may be a confounding or interacting variable. The alternative terms explanatory variable, independent variable, or predictor, are used in a regression analysis.

What is the purpose of a covariate?

Covariates are commonly used as control variables. For instance, use of a baseline pre-test score can be used as a covariate to control for initial group differences on math ability or whatever is being assessed in the ANCOVA study.

Can gender be a covariate?

As stated earlier, you can have categorical covariates (e.g., a categorical variables such as “gender”, which has two categories: “males” and “females”), but the analysis is not usually referred to as an ANCOVA in this situation.

What is a covariate vs confounder?

Confounding occurs when there is a relation between a certain characteristic or covariate (C) and group allocation (G) and also between this characteristic and the outcome (O). When the occurs the covariate (C) is termed a confounder. Whereas: Mediators are part of the causal pathway from exposure to outcome.

Is age a covariate?

Age, sex, and intracranial volume were found to be the most commonly used covariates, although the number of covariates used ranged from 0 to 14, with 37 different covariate sets across the 68 models tested.

What is a mediator vs confounder?

A confounder is a third variable that affects variables of interest and makes them seem related when they are not. In contrast, a mediator is the mechanism of a relationship between two variables: it explains the process by which they are related.

Is a covariate a moderator?

The role played by a variable depends how it is related to the intervention and outcome measure in a particular study. For this reason, a variable that is a moderator in one study may be a covariate in another study.

How do you determine if a variable is a confounder or mediator?

If the variable is a true mediator, then changes in the dependent variable should be specific to changes in that mediator and not others. If the variable is a confounder, the manipulation should not change effects because of the lack of causal relationship between the confounder and the outcome.