trader_beta

(PECL trader >= 0.2.0)

trader_beta — Beta

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trader_beta ( array $real0 , array $real1 [, int $timePeriod ] ) : array

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real0: ��顣
real1: ��顣
timePeriod: Number of period. Valid range from 2 to 100000.

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Returns an array with calculated data or false on failure.