(PECL trader >= 0.2.0)
Pearson's Correlation Coefficient (r)
array trader_correl ( array $real0, array $real1 [, integer $timePeriod ] )
Parameters:
real0
Array of real values.
real1
Array of real values.
timePeriod
Number of period. Valid range from 2 to 100000.
Returns:
Returns an array with calculated data or false on failure.
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