Extract Stratification Variable

DESCRIPTION:

This function is generic; method functions can be written to handle specific classes of objects. Classes which already have methods for this function include data.frame.

USAGE:

getStrata(object, ...) 

REQUIRED ARGUMENTS:

object
any object
...
some methods for this generic function may require additional arguments.

VALUE:

will depend on the method function used; see the appropriate documentation.

SEE ALSO:

,

EXAMPLES:

## see the method function documentation