Getting an average of a subset of data
Hi, I have intensities of 4 treated and 5 untreated samples taken between at a range of wavelengths (400 - 600 nm) at three different time points (0, 1 , 3 hours). In the long run, I'm trying to normalize my data so the average intestity at 400nm of the untreated samples is 1 at each time point. In order to do that, I need to figure out how to get the average untreated, 400nm intensity at 0, 1, ...