stats_cdf_f

(PECL stats >= 1.0.0)

stats_cdf_fCalculates any one parameter of the F distribution given values for the others

Description

float stats_cdf_f ( float `\$par1` , float `\$par2` , float `\$par3` , int `\$which` )

Returns the cumulative distribution function, its inverse, or one of its parameters, of the F distribution. The kind of the return value and parameters (`par1`, `par2`, and `par3`) are determined by `which`.

The following table lists the return value and parameters by `which`. CDF, x, d1, and d2 denotes cumurative distribution function, the value of the random variable, and the degree of freedoms of the F distribution, respectively.

Return value and parameters
`which` Return value `par1` `par2` `par3`
1 CDF x d1 d2
2 x CDF d1 d2
3 d1 x CDF d2
4 d2 x CDF d1

Parameters

`par1`

The first parameter

`par2`

The second parameter

`par3`

The third parameter

`which`

The flag to determine what to be calculated

Return Values

Returns CDF, x, d1, or d2, determined by `which`.

``` Input  and return values of stats_cdf_t depends on the \$which-parameter:<?phpfunction get_t_p(\$t, \$df){   return stats_cdf_t(\$t, \$df, 1);}function get_t_t(\$p, \$df){   return stats_cdf_t(\$p, \$df, 2);}function get_t_df(\$p, \$t){   return stats_cdf_t(\$p, \$t, 3);}?> ```