Hello,

I have to compute the pooled z-value and I would like to know which way is
more appropriate


b <- c( -0.205,1.040,0.087)
s <- c(0.449,0.167,0.241)
n <- c(310, 342, 348)
z <- b/s

Z <- sum(z)/sqrt(length(n))
P <- 2*(1-pnorm(abs(Z)))
P

w <- sqrt(n)
Zw <- sum(w * z)/sqrt(sum(w^2))
Pw <- 1 - pchisq(Zw * Zw, 1)
Pw


Many thanks in advance,
Cheba

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