As one of the output file of macs2 is in excel form which tells -log10(q-value) which is the FDR (False Discover Rate)
I wan to ask whether the highest q-value is reliable or the lowest as every peak has its own -log10(q-value)
In other words if -log10(q-value) is 10.08 of one peak is that mean that peak has high chance to be a false positive or its the other way around ?
An FDR (or q-value) is an adjusted p-value, therefore the lowest q-value is the most significant. However, in this case you're not looking at q-values, but at -log10(q-value), in which case the highest number is more informative (because of that negative sign). For example, if q = 10^-10 that's a highly significant value, and -log10(10^-10) = 10, a high positive number.
The lowest q-value is most significant, and the highest -log10(q-value) is most significant.