n<-190 # (Sample size-1)

dfM1<-19 # degrees of freedom of M1

dfM2<-26 # degrees of freedom of M2

delta<-dfM2*.05ˆ2 # define delta in the alternative hypothesis

alpha<-.05

cv<-qchisq(1-alpha,df=dfM2-dfM1) # Critical value under the null hypothesis

power<-1-pchisq(cv,df=dfM2-dfM1,ncp=n*delta)

print(power,digits=2)