Nothing

```
beta.mom <- function(x,lower=0.01,upper=100) {
x.bar <- mean (x)
n <- length(x)
v <- var(x) * (n-1) / n
R <- 1/x.bar - 1
f <- function(a){ # note: undefined when a=0
R * a^2 / ( (a/x.bar)^2 * (a/x.bar + 1) ) - v
}
u <- uniroot(f,c(lower,upper))
return( c(shape1=u$root, shape2=u$root * R) )
}
x <- rbeta(50,2,5); beta.mom(x)
```

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