1. ## How to read F test table?

For the table
http://www.stattools.net/FTest_Tab.php

What is numerator degrees of freedom and denominator degrees of freedom?

Thank you.

2. ## Re: How to read F test table?

For a regression model with intercept numerator df=k & denominator df=n-k+1 where n=# of obs & k is the # of parameters being estimated. Without intercept num df=k-1 & den df=n-k

3. ## Re: How to read F test table?

For ANOVA

This F-statistic follows the F-distribution with K − 1, N −K degrees of freedom under the null hypothesis.

Where K is the number of groups

http://en.wikipedia.org/wiki/F-test

4. ## Re: How to read F test table?

You look at your test statistic and if it was created by taking the ratio of two independent Chisquare random variables divided by their degrees of freedom then the numerator degrees of freedom is equivalent to the degrees of freedom of the chi-square in the numerator of the ratio. The denominator degrees of freedom end up being the degrees of freedom of the chi-square in the denominator.

If the F-stat arose some other way (I can't think of any off the top of my head) then you'll have to figure it out some other way.

Or you could just do what jrai mentions because that's probably what you're looking at?

 Tweet

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts