I am trying to do statistical analysis on data where my x axis is categorical. I have five different treatment groups on the x axis. My y axis is continuous (mRNA levels of a certain gene responding to the different treatment groups). I was planning on using one-way ANOVA and post-hoc testing.
However, I have a lot of variation between patients (I'm looking at mRNA level responses in cells from 7 different patients). Because of this, my data does not follow a normal distribution. Once I log transform the y axis data it does follow a normal distribution. However, my statistical knowledge is pretty basic- can I log transform the y axis and keep the x axis as treatment categories (bar graph)? Or is it a rule that to be able to log transform the data both x and y axes must be log transformed? Obviously I can't log transform categorical data so I'm not sure how to approach this..
Any help would be very much appreciated!!