How do I calculate the CDF of the chi-square distribution in excel?

Question

Does excell have a function for the cdf of the chi-square distribution?

If not then how do I calculate it manually?

I cant seem to find what I'm looking for when i try searching online. This is the formula:

I simply don't understand how to plug values into the formula to calculate a result.

Answer 1

If you have Excel 2010 or later, there is a function for this.

=CHISQ.DIST(x, degrees_freedom, cumulative)

This function accepts three parameters:

• x , the value at which the chi-square distribution is to be calculated
• degrees_freedom , the number of degrees of freedom
• cumulative , a TRUE or FALSE conditional, false gives you the PDF and true gives you the CDF, so you'd want true

You can read more from Microsoft .

If you're using Excel 2007 or earlier, it will require more creativity as Excel's only built in chi-square distribution functions are for right-tailed probabilities.