stats (version 3.4.1)

na.action: NA Action

Description

Extract information on the NA action used to create an object.

Usage

na.action(object, …)

Arguments

object

any object whose NA action is given.

…

further arguments special methods could require.

Value

Information from the action which was applied to object if NAs were handled specially, or NULL.

Details

na.action is a generic function, and na.action.default its default method. The latter extracts the "na.action" component of a list if present, otherwise the "na.action" attribute.

When model.frame is called, it records any information on NA handling in a "na.action" attribute. Most model-fitting functions return this as a component of their result.

References

Chambers, J. M. and Hastie, T. J. (1992) Statistical Models in S. Wadsworth & Brooks/Cole.

See Also

options("na.action"), na.omit, na.fail, also for na.exclude, na.pass.

Examples

na.action(na.omit(c(1, NA)))