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Power for using McNamr's test

The power, pow, is produced for McNemar's test comparing mismatch proportions, p12 and p21, in a sample size of ntot with a type I error of alpha.

Copy and Paste the inputs below into R and adjust as required. 

alpha <- 0.05
p12 <- 0.5
p21 <- 0.2
ntot <- 23

Copy and paste the below into R to obtain the power. 

chisq <- ((p12-p21)^2) / (p12+p21)
pow <- 1 - pchisq(abs(qchisq(1-alpha,1)),1,ntot*chisq)
cat("Power for McNemar's test =")
print(pow)