(PECL trader >= 0.2.0) Vector Trigonometric ACos array trader_acos ( array $real ) Calculates the arc cosine for each value in real and returns the resulting array. Parameters: real Array of real values. Returns: Returns an array with calculated data or false on failure.

(PECL stats >= 1.0.0) Returns the population variance float stats_variance ( array $a [, bool $sample = false ] ) Parameters: a sample Returns: This function is currently not documented; only its argument list is available.

(PECL stats >= 1.0.0) Not documented float stats_stat_powersum ( array $arr, float $power ) Parameters: arr power Returns: This function is currently not documented; only its argument list is available.

(PECL stats >= 1.0.0) Not documented float stats_stat_percentile ( float $df, float $xnonc ) Parameters: df xnonc Returns: This function is currently not documented; only its argument list is available.

(PECL stats >= 1.0.0) Not documented float stats_stat_paired_t ( array $arr1, array $arr2 ) Parameters: arr1 arr2 Returns: This function is currently not documented; only its argument list is available.

(PECL stats >= 1.0.0) Calculates any one parameter of the noncentral t distribution give values for the others. float stats_stat_noncentral_t ( float $par1, float $par2, float $par3, int $which ) Parameters: par1 par2 par3 which Returns:

(PECL stats >= 1.0.0) float stats_stat_innerproduct ( array $arr1, array $arr2 ) Parameters: arr1 arr2 Returns: This function is currently not documented; only its argument list is available.

(PECL stats >= 1.0.0) Not documented float stats_stat_independent_t ( array $arr1, array $arr2 ) Parameters: arr1 arr2 Returns: This function is currently not documented; only its argument list is available.

(PECL stats >= 1.0.0) Not documented float stats_stat_gennch ( int $n ) Parameters: n Returns: This function is currently not documented; only its argument list is available.

(PECL stats >= 1.0.0) Not documented float stats_stat_correlation ( array $arr1, array $arr2 ) Parameters: arr1 arr2 Returns: This function is currently not documented; only its argument list is available.