Meteorite | Level 14

## Folded f test and F Test

Hello

Is there a difference between folded F test and Fisher F test.
(The new SAS Certification guide for statistical business analyst uses this term).

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Accepted Solutions
Opal | Level 21

## Re: Folded f test and F Test

The folded F test is also called the F test of equality of variances, it is based on the F distribution.

https://en.wikipedia.org/wiki/F-test_of_equality_of_variances

The same F-test (sometimes called Fisher's F test) is also used in the context of ANOVA.

Both versions of the test are based on the ratio of variances. The folded version puts the greater variance at the numerator before comparing to the F distribution while the ANOVA test doesn't.

PG
Opal | Level 21

## Re: Folded f test and F Test

The folded F test is also called the F test of equality of variances, it is based on the F distribution.

https://en.wikipedia.org/wiki/F-test_of_equality_of_variances

The same F-test (sometimes called Fisher's F test) is also used in the context of ANOVA.

Both versions of the test are based on the ratio of variances. The folded version puts the greater variance at the numerator before comparing to the F distribution while the ANOVA test doesn't.

PG
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