Hello all
I am struggling to find the right technique for analyzing my data. 20 subjects experienced all levels of both factors. Both factors had four levels. The residuals for most DVs were not normally distributed as would be assumed for a two-way repeated-measures ANOVA. I am not aware of a corresponding non-parametric test. How should I proceed? I am told removing outliers is unwise with small sample size. I have encountered the Box-Cox method of finding ideal transformations for data. Is there a way to find the optimum transformation to use when there are many combinations of factor levels (4x4=16) as with my data? Do I need residuals of DVs for all 16 combinations of factors to be normally distributed or can I proceed if I find a transformation that normalizes the data for most of the factor level combinations? Thanks for any advice, suggested techniques, reading materials, etc.
Z. Redding
I am struggling to find the right technique for analyzing my data. 20 subjects experienced all levels of both factors. Both factors had four levels. The residuals for most DVs were not normally distributed as would be assumed for a two-way repeated-measures ANOVA. I am not aware of a corresponding non-parametric test. How should I proceed? I am told removing outliers is unwise with small sample size. I have encountered the Box-Cox method of finding ideal transformations for data. Is there a way to find the optimum transformation to use when there are many combinations of factor levels (4x4=16) as with my data? Do I need residuals of DVs for all 16 combinations of factors to be normally distributed or can I proceed if I find a transformation that normalizes the data for most of the factor level combinations? Thanks for any advice, suggested techniques, reading materials, etc.
Z. Redding