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Check if covariates are discrete

Source: R/utils.R
is_discrete.Rd

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).

Value

TRUE for all being discrete; FALSE otherwise.

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