note 101528 added to function.stats-standard-deviation
| From: | TheNaughtyBadger at osu1 dot php dot net | Date: | Wed, 22 Dec 2010 16:25:39 +0000 |
| Subject: | note 101528 added to function.stats-standard-deviation | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-175141@lists.php.net to get a copy of this message | ||
The $sample parameter dictates whether n, or n-1 should be used to calculate the variance. When set
to true, n-1 is used. You should do this when you pass a sample of data, rather than the entire
dataset, or if you wish to use the standard deviation for extrapolation of future values.
http://www.graphpad.com/faq/viewfaq.cfm?faq=1382
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