Nothing

```
position.leverage <- function(data, F, to = NULL, rep = 50, by = 1)
{
N = ncol(data)
D = rep(1, N)
leverage.vals = c()
if(is.null(to))
{
to = F(lookup.samples(data, list(convert.table.to.idx(D)))[[1]])
}
for(i in seq(1,N,by))
{
Dp = D;
S = sample(N, N/rep);
while(i %in% S)
{
S = sample(N,N/rep);
}
Dp[S] = 0;
Dp[i] = N/rep;
new.tree = F(lookup.samples(data, list(convert.table.to.idx(Dp)))[[1]])
leverage.vals = c(leverage.vals, as.matrix(dist.multiPhylo(list(to,
new.tree)))[1,2])
}
leverage.vals
}
```

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