The internal functionality of this class is manipulate a data set to obtain the standard deviation and the variance of the set.
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In statistics, the standard deviation (SD, also represented by the lower case Greek letter sigma σ or the Latin letter s) is a measure that is used to quantify the amount of variation or dispersion of a set of data values.
require_once("src/StandardDeviation.php");
# Example of data set
$data = [1,2,3,4,7,8,10,5.5];
$standard = new Statistic\StandardDeviation();
# Inputting the data set
$standard->setRawGroup($data);
# Methods available to be used
var_dump($standard->variance());
var_dump($standard->deviation());
var_dump($standard->average());