Updated: 31 July 2015

Use CHISQ_DIST_RT to calculate the upper distribution of a chi-squared distribution for x and a number of degrees of freedom.

SELECT [wct].[CHISQ_DIST_RT](

<@X, float,>

,<@Degrees_freedom, float,>)

The value of interest to be evaluated. *@X* must be of a type **float** or of type that intrinsically converts to **float**.

The number of degrees freedom. *@Degrees_freedom* must be of a type **float** or of a type that intrinsically converts to **float**.

float

· 0 < *@X*

· 0 < *@Degrees_freedom*

In this example we calculate the right-tailed probability.

SELECT

wct.CHISQ_DIST_RT(

0.5 --@X

,1 --@Degrees_freedom

) as [Right Tail]

This produces the following result

The chi-squared distribution is a special case of the gamma distribution

SELECT

wct.CHISQ_DIST_RT(x,df) as [Chi-squared]

,wct.GAMMAQ(0.5*df,0.5*x) as GammaQ

FROM (VALUES (42,57))n(x,df)

This produces the following result.