Key points are not available for this paper at this time.
Abstract Under fairly general conditions the studentized range can be used to approximately simultaneously estimate all linear combinations of a set of means for an unbalanced AOV fixed effects model. These new methods are called extended Tukey procedures (Ext-T). Comparisons are made with the Scheffé (S) procedures. It is recommended generally that the (Ext-T) procedures be used if primary interest is in pairwise comparisons of the means and if the unbalance is not severe.
Spjøtvoll et al. (Sat,) studied this question.