boxcoxnc utilizes seven different normality tests and artifical covariate method to estimate Box-Cox power transformation parameter and provides graphical analysis
boxcoxfr estimates Box-Cox power transformation parameter. It is useful to use if the normality or/and the homogenity of variance is/are not satisfied while comparing two or more groups. While estimating transformation parameter, maximum likelihood estimation in feasible region (MLEFR) is used. MLEFR maximizes the likehood function in feasible region constructed by Shapiro-Wilk test and Bartlett's test. After transformation parameter is estimated, normality of groups and homogenity of variance are checked by Shapiro-Wilk test and Bartlett's test, respectively.
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