# Re: [R] (no subject)

From: bartjoosen <bartjoosen_at_hotmail.com>
Date: Mon, 17 Mar 2008 08:09:55 -0700 (PDT)

There are several mistakes:
Why are you using only p[1], p[2]?
Afterwards you try (for i in 1:10) p[i] so you should go to p[10]? Then you should make a pnew wich holds 10 values, so pnew[i]

This should get you back on track

Bart

Kathy Maher wrote:
>
> Hi,
>
> I am trying to use the Fisher scoring method with a geometric
> distribution,
> with p = .07, 100 observations from the geom distrib, and 10 iterations.
> I cannot quite get the code to work.
> Can anyone see the mistake?
>
>
>
>
> n <- 100
>
> p <- 0.07
>
> x <- rgeom(n, p)
>
> s <- sum(x)
>
> f <- function(x, p) p*(1-p)^x
>
> L <- function(p) p^n*(1-p)^s
>
> logL <- function(p) n*log(p)+s*(log(1-p))
>
> logLprime <- function(p) (n/p)-(s/(1-p))
>
>
>
> I <- n/p^2*(1-p)
>
> iter <- 10
>
> p[1] <- .06
>
> p[2] <- .11
>
>
>
>
>
> for (i in 1:10)
>
> {
>
> pnew <- p[i]+logLprime(p[i])/I*(p[i])
>
> }
>
> [[alternative HTML version deleted]]
>
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