(PECL trader >= 0.2.0)
trader_beta — Beta
$real0, array $real1, int $timePeriod = ?): array
real0浮點(diǎn)數數組。
real1浮點(diǎn)數數組。
timePeriodNumber of period. Valid range from 2 to 100000.
Returns an array with calculated data or false on failure.