Nothing

```
weibull.fit <-
function(x, y, cens, weights){
if (any(weights <= 0)){
keep <- weights > 0
x <- x[keep, ]
y <- y[keep]
cens <- cens[keep]
weights <- weights[keep]
}
fit<-survreg(Surv(y,cens)~x-1, weights=weights)
gamma<-coef(fit)
alpha<-1/fit$scale
beta<- -gamma*alpha
return(list(beta=beta,alpha=alpha,mm=model.matrix(fit)))
}
```

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