先用excel算出两组数的平均值μ1和μ2，
=STDEV(选中所有数据)算出均方误差：MSE，也就是σ^2
=SQRT(MSE) 均方误差开根号： σ
d=(μ1-μ2)/ σ
library(pwr)
# CD3 n = 3.783499
pwr.t.test(d=2.8938, sig.level=0.05, power = 0.9, type="two.sample",alternative="two.sided")
#CD4 # n = 3.048967
pwr.t.test(d=3.5289, sig.level=0.05, power = 0.9, type="two.sample",alternative="two.sided")
#CD8 # n = 2.739429
pwr.t.test(d=3.97746, sig.level=0.05, power = 0.9, type="two.sample",alternative="two.sided")
# CD3 power = 1
pwr.t.test(d=2.8938, sig.level=0.05, n = 25, type="two.sample",alternative="two.sided")
#CD4 power = 1
pwr.t.test(d=3.5289, sig.level=0.05, n = 19, type="two.sample",alternative="two.sided")
#CD8 power = 1
pwr.t.test(d=3.97746, sig.level=0.05, n = 18, type="two.sample",alternative="two.sided")
