[R] Mixed effect multinomial regression

Hello list, I was trying to investigate the possible use of a mixed effect multinomial logit model in R. Does anyone have suggestions on where to find information on these models and the associated functions in R. Thanks in advance, jm -- James A. Martin 850-445-9773 [[alternative HT

[R] Custom Link/Family for lmer

Hello List, I am modeling a binomial response (nest survival) and I want to incorporate a random effect, in this case site. I had previously been using glm with a custom link function, but my understanding is that lmer does not currently allow a custom link. Therefore, I was investigating if oth

Re: [R] Select values at random by id value

ddply(df, c("date", "id"), function(df) df[sample(nrow(df), 1), ]) Thanks to Hadley and Sunil. The above code solves my problem. jm On Mon, Jun 29, 2009 at 9:11 AM, James Martin wrote: > All, > > I have data that looks like below. For each id there may be more than

Re: [R] Select values at random by id value

Hadley, Sunil, and list, This is not quite doing what I wanted it to do (as far as I can tell). I perhaps did not explain it thoroughly. It seems to be sampling one value for each day leaving ~200 observations. I need for it randomly chose one hab value for each bird if there is more than one val

[R] Select values at random by id value

All, I have data that looks like below. For each id there may be more than one value per day. I want to select a random value for that day for that id. The end result would hopefully be a matrix with the id as rows, date as columns and populated by the random hab value. Thanks to someone on her

[R] data formatting

All, I have three columns of data: id, date, hab. I am trying to set up a matrix that has the id as the rows, date as columns, and the hab value as the data values. Each id/date combination can only have one hab value. I would like for it to look something like this" date 1, date 2, dat