Variation Levene test

To calculate if there is a significant difference between variation of the two datasets. This test is robust when the data is not normally distributed. It calculates the Levene variation test between this column and the comparing column.

Interpretation

• The smaller the p value is the more likely there is a significant difference between the variation in the 2 data sets.
• In Develve for variation a significant difference the p value must be below 0.05.
• If the datasets is normally distributed use the Variation F-test
• For this test is no minimum sample size (power) calculation

Options

• Bigger/Smaller (one sided test) or not equal test (two sided)

Colors of the cells

• Green No significant difference
• Yellow Significant difference

Formula Calculating F value

Legend

Mean of all data
Mean group

total number of samples
number of groups

Example

Select Variation test. To use the Levene test first select "non normal distributed" when the box is not selected the F-test is calculated. Then select Diff variation.

External links

• http://en.wikipedia.org/wiki/Levene_test
• http://www.itl.nist.gov/div898/handbook/eda/section3/eda35a.htm