title: var, sd, cor functions that have n as denominator
body: <p><code>var</code>, <code>sd</code>, <code>cor</code> functions in <code>{stats}</code> use <code>n-1</code> as a denominator (where <code>n</code> the number of observations). Out of curiosity, are there equivalent function that use <code>n</code> as a denominator?</p>