is_discrete {baker}

Check if covariates are discrete

Description

is_discrete checks if the specified covariates could be regarded as discrete variables.

Usage

is_discrete(X, X_reg)

Arguments

X

A data frame of covariates

X_reg

The vector of covariates that will stratify the analyses. These variables have to be categorical. Or a formula (can be tested by is.formula in plyr), e.g., ~as.factor(SITE8) + as.factor(AGECAT > 1).

Details

Note that this function should be used with caution. It used

nrow(X)/nrow(unique(X[,X_reg,drop=FALSE]))>10

as an ad hoc criterion. It is not the same as is.discrete() in plyr

Value

TRUE for all being discrete; FALSE otherwise.