margin.table {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

### Examples

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

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