na.action               package:stats               R Documentation

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.

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.

Value:

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

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)))

