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getStandardDeviation - Return the standard deviation of the given serie

This function will return you the standard deviation of the given serie.

Calling this function
getStandardDeviation($Serie="Serie1");

Where :

Serie is the name of the serie.

Sample script

 /* Create the pData object */
 $MyData = new pData(); 

 /* Add some points to "My serie 1" */
 $MyData->addPoints(array(1,2,3,4),"My serie 1");

 /* Display the standard deviation of "My serie 1" */
 echo $MyData->getStandardDeviation("My serie 1");
Last updated on 08/03/2011 
by Jean-Damien 
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