Dear R-maillit,

I have to perform a stastistical test to asses if two grug show the same or different effect on my prepartion.
I tested on the same preparation only one drug and I have to use normalized data due to high variability in the control condictions.
What type can I use? 
A non paramatric test right?
And how can do it on R software?
Thanks in advance

Simone


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