It is incorrect to take 27.5 Myr as a prior fixed quantity when there was no prior theoretical reason to expect that period. Correct analysis would ask, given

It is incorrect to take 27.5 Myr as a prior fixed quantity when there was no prior theoretical reason to expect that period. Correct analysis would ask, given a randomly generated data set, what are the odds as strong a signal as this is generated for any recurring period in some range (like 3Myr-100Myr)