Nothing

```
"nsibs" <-
function(ls,lo,alpha, beta)
{
# calculate number of affected sibpairs needed to detect linkage to a
# susceptibility gene attributed with a user specified lambda_sib/
# lambda_1. Lambda_sib is the recurrence risk ratio for full- sibs
# (includes dominance variance), lambda_1 is the recurrence risk ratio
# for parent- offspring pairs (so does not include dominance variance).
# In these calculations we assume that parents and sibs are completely
# genotyped with markers that perfectly define the IBD configurations.
# alpha and beta correspond to the type 1 and 1 - type 2 error rates
# respectively.
z0 <- 0.25/ls
z1 <- 0.50*lo/ls
zalpha <- qnorm(1-alpha)
zbeta <- qnorm(beta)
y <- 1 - 0.5*z1 - z0
sigma <- sqrt(4*y*(1-y))
mu <- 2*y-1
n <- ((zalpha - sigma*zbeta)^2)/(2*mu^2)
return(n)
}
```

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