Mean Square Environment Use this option to specify the mean square for environments from the combined ANOVA of the original data with replicates. This information is needed for the estimation of Alpha_i , as described by Tai (1971)1. To Specify the Mean Square within Environments: Check the Input data contains means of genotypes on each environment check box. Enter the desired value in the text box. Acceptable values range from 0 to 1,000,000. 1 Tai, C.C.G. (1971) Genotypic Stability Analysis and Its Application to Potato Regional Trials. Crop Science 11(2): 184-190.