stats_cdf_t
(PECL stats >= 1.0.0)
stats_cdf_t — Calculates any one parameter of the t-distribution given values for the others
説明
Returns the cumulative distribution function, its inverse, or one of its parameters,
of the t-distribution. The kind of the return value and parameters
(par1
and par2
) are determined by
which
.
The following table lists the return value and parameters by which
.
CDF, x, and nu denotes cumulative distribution function, the value of the random
variable, and the degrees of freedom of the t-distribution, respectively.
which |
Return value | par1 |
par2 |
---|---|---|---|
1 | CDF | x | nu |
2 | x | CDF | nu |
3 | nu | x | CDF |
パラメータ
par1
-
The first parameter
par2
-
The second parameter
which
-
The flag to determine what to be calculated
戻り値
Returns CDF, x, or nu, determined by which
.
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User Contributed Notes 2 notes
Brian ¶
14 years ago
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.