In order to match the output of this function with Excel's TDIST function, you must take 1 - the value. For example, for a two-tailed T-distribution for x=4 and degrees of freedom=2, the formula would be:
(1 - stats_cdf_t(4, 2, 1)) * 2
For a single tail, do not include the multiply by 2 portion.
(PECL stats >= 1.0.0)
stats_cdf_t — Calculates any one parameter of the T distribution given values for the others.
float stats_cdf_t ( float
This function is currently not documented; only its argument list is available.
add a note User Contributed Notes stats_cdf_t - [2 notes]
2 years ago