[R] (no subject)

[bartjoosen]

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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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
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> 
> 

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