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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) > >...