To achieve a normal distribution of my experimental data, I did a transformation using the formula: y = square root (x+0,5). On the transformed data I then performed a Fisher's LSD test, giving me the LSD value for the transformed data. Simple backtransformation of that LSD value using the inverse formula x = y^2-0,5 does not seem to work (the backtransfromed LSD is way too low to make any sense at all). I could not find any info on the internet, only that backtransformation of the LSD value using the inverse formula is not valid.
Anyone knows how to do it?
Thanks a lot.