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Dear list, I am fitting a logistic multi-level regression model and need to test the difference between the ordinary logistic regression from a glm() fit and the mixed effects fit from glmer(), basically I want to do a likelihood ratio test between the two fits. The data are like this: My outcome is a (1,0) for health status, I have several (1,0) dummy variables RURAL, SMOKE, DRINK, EMPLOYED,

Dear all, It appears that MASS::polr() and Design::lrm() return the same point estimates but different st.errs when fitting proportional odds models, grade<-c(4,4,2,4,3,2,3,1,3,3,2,2,3,3,2,4,2,4,5,2,1,4,1,2,5,3,4,2,2,1) score<-c(525,533,545,582,581,576,572,609,559,543,576,525,574,582,574,471,595, 557,557,584,599,517,649,584,463,591,488,563,553,549) library(MASS) library(Design)

...nd nested) and vector-valued random effects. - profile methods for variance parameters in mixed effect models. - helpful package vignettes. - implementation of core functions in C. Comments, critique, suggestions, wishes and contributions are always highly appreciated. Kind regards Rune -- Rune Haubo Bojesen Christensen PhD student, M.Sc. Eng. Phone: (+45) 45 25 33 63 Mail: rhbc at imm.dtu.dk DTU Informatics, Section for Statistics Technical University of Denmark, Build. 305, Room 122, DK-2800 Kgs. Lyngby, Denmark _______________________________________________ R-packages mailing list R-pack...

...nd nested) and vector-valued random effects. - profile methods for variance parameters in mixed effect models. - helpful package vignettes. - implementation of core functions in C. Comments, critique, suggestions, wishes and contributions are always highly appreciated. Kind regards Rune -- Rune Haubo Bojesen Christensen PhD student, M.Sc. Eng. Phone: (+45) 45 25 33 63 Mail: rhbc at imm.dtu.dk DTU Informatics, Section for Statistics Technical University of Denmark, Build. 305, Room 122, DK-2800 Kgs. Lyngby, Denmark _______________________________________________ R-packages mailing list R-pack...

Dear list members, I am estimating an ordinal generalized estimating equations (GEE) regression model on repeated measurements data. Is there any way (preferably in R) to test the proportional odds assumption of this model? Thanks in advance. Andreas [[alternative HTML version deleted]]

Dear List,   I have some longitudinal data, each patient was followed at times 0, 12, 16, 24 weeks and measure severity of a illness (0-worse, 1-same, 2-better). So, longitudinal response is categorical.  I was wondering whether lmer in R can fit a model for this type of data. If so, how we code? Or any other function in R that can fit this type of longitudinal data? Any suggestion would be

Hi, I want to fit some psychophysical data with cumulative gaussians. There is quite a convenient toolbox for matlab called 'psignifit' (formerly known as 'psychofit'). It allows the lower bound of the sigmoid to vary slightly from zero, aswell as the upper bound to vary from one. with these two free parameters, the fitted function is less sensitive to noisy data and outliers.

Hello, I am trying to run an ordinal logistic regression (polr) using the package 'MASS'. I have successfully run other regression classes (glm, multinom) without much problem, but with the 'polr' class I get the following error: " Error in svd(X) : infinite or missing values in 'x' " which appears when I run the "summary" command. The data file is

...how find and use a csv file? (Faradj Koliev) > 65. Re: estimation of NA by predict command (arun) > 66. Changing x-axis values displayed on histogram (jlwoodard) > 67. Re: Package 'MASS' (polr): Error in svd(X) : infinite or > missing values in 'x' (Rune Haubo) > 68. Re: HELP me please with import of csv to R (Sarah Goslee) > 69. Understanding cenros Error (Rich Shepard) > 70. Re: Need HELP: how find and use a csv file? (Sarah Goslee) > 71. Re: calculating the difference between days? (C W) > 72. Re: Need HELP: how find and...

...e at the URL given below, if you need to have backward compatibility. It should be possible to have both the ncdf and ncdf4 packages installed simultaneously without a problem. However, the ncdf package does not provide an interface for netcdf version 4 files. * ordinal (2010.03-04) Rune Haubo B Christensen http://crantastic.org/packages/ordinal This package implements likelihood based models for ordinal (ordered categorical) data based on cumulative probabilities in the framework of cumulative link models. This includes the important proportional odds model but also allows fo...