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situat
2009 May 12
1
Power function for ratio of lognormal means: two equally valid results? [SEC=Unclassified]
Hi All
This is a general stats problem that I am dealing with using R, so any help is greater appreciated.
I have two lognormal distributions with means M1 and M2.
If we have:
H0: log(M1/M2)=0
H1: log(M1/M2) !=0 equivalent to log(M1/M2)=log(1+P) where P<0 or P>0.
If we calculate the power for a value of P=0.1 or P=-0.1 (i.e. a 10% difference) and say assume SE{log(M1/M2)}=0.05, and