Re: [R] Sample size of longitudinal and skewed data

t.org] On Behalf Of Lao Meng > Sent: Monday, March 21, 2011 1:20 AM > To: R help > Subject: [R] Sample size of longitudinal and skewed data > > Hi all: > I have a question about the sample size calculation. > > It's a pilot study,which includes 2 groups(low,high),3 t

[R] Sample size of longitudinal and skewed data

Hi all: I have a question about the sample size calculation. It's a pilot study,which includes 2 groups(low,high),3 time point(3,6,9 monthes).Each person has 3 results which according to the 3 time points.So it's a longitudinal study. I want to calculate the minimum sample size from the pilot st