Displaying 3 results from an estimated 3 matches for "ahnate".
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2011 Jan 27
2
Extrapolating values from a glm fit
Dear R-help,
I have fitted a glm logistic function to dichotomous forced choices
responses varying according to time interval between two stimulus. x values
are time separation in miliseconds, and the y values are proportion
responses for one of the stimulus. Now I am trying to extrapolate x values
for the y value (proportion) at .25, .5, and .75. I have tried several
predict parameters, and they
2011 Sep 23
1
Adding weights to optim
I realize this may be more of a math question. I have the following optim:
optim(c(0.0,1.0),logis.op,x=d1_all$SOA,y=as.numeric(md1[,i]))
which uses the following function:
logis.op <- function(p,x,y) {
ypred <- 1.0 / (1.0 + exp((p[1] - x) / p[2]));
res <- sum((y-ypred)^2)
return(res)
}
I would like to add weights to the optim. Do I have to alter the logis.op
function by
2011 Sep 24
1
help
...; 70. Re: randomForest - NaN in %IncMSE (Liaw, Andy)
> 71. Re: Small Area Estimate Using Structural Equation Models
> (Peter Maclean)
> 72. Re: Kolmogorov-Smirnov test (Greg Snow)
> 73. Re: Adding weights to optim (Rolf Turner)
> 74. Re: Adding weights to optim (Ahnate Lim)
> 75. ncdf - install error (Muhammad Rahiz)
> 76. Re: ncdf - install error (Jeff Newmiller)
> 77. Re: spatstat => owin + image (Rolf Turner)
> 78. Re: Kolmogorov-Smirnov test (rommel)
> 79. ggplot2: expression() in legend labels? (Casper Ti. Vector)
>
>...