Do-nothing na.action

Description

Does not delete rows containing NAs, but does add details concerning the distribution of the response variable if options(na.detail.response=TRUE). This na.action is primarily for use with describe.formula.

Usage

na.keep(mf)

Arguments

Value

the same model frame with the "na.action" attribute

Author(s)

Frank Harrell
Department of Biostatistics
Vanderbilt University
f.harrell@vanderbilt.edu

See Also

na.omit, na.delete, model.frame.default, na.detail.response, naresid, naprint, describe

Examples

options(na.action="na.keep", na.detail.response=TRUE)
x1 <- runif(20)
x2 <- runif(20)
x2[1:4] <- NA
y <- rnorm(20)
describe(y ~ x1*x2)