margin.table              package:base              R Documentation

Compute table margin

Description:

     For a contingency table in array form, compute the sum of table
     entries for a given index.

Usage:

     margin.table(x, margin=NULL)

Arguments:

       x: an array

  margin: index number (1 for rows, etc.) 

Details:

     This is really just 'apply(x, margin, sum)' packaged up for
     newbies, except that if 'margin' has length zero you get 'sum(x)'.

Value:

     The relevant marginal table.  The class of 'x' is copied to the
     output table, except in the summation case.

Author(s):

     Peter Dalgaard

See Also:

     'prop.table' and 'addmargins'.

Examples:

     m <- matrix(1:4,2)
     margin.table(m,1)
     margin.table(m,2)

