The test statistics is:
- is the value of the th of observations in the th of groups, where has been 'centered' such that ,
- is the average in the th group,
- is the overall average,
- is the calibrated weight,
- , and
- is computed using the Greenhouse-Geisser method.
- ↑ Greenhouse SW, Geisser S (1959) On methods in the analysis of profile data. Psychometrika, 24, 95-112.