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I have a question about how to compare a GLM with a GAM model using anova function. A GLM is performed for example: model1 <-glm(formula = exitus ~ age+gender+diabetes, family = "binomial", na.action = na.exclude) A second nested model could be: model2 <-glm(formula = exitus ~ age+gender, family = "binomial", na.action = na.exclude) To compare these two GLM

Hi everyone, I am doing 5 years mortality predictive index score with survival analysis using a Cox proportional hazard model where I have a continous predictive variable and a right censored response which is the mortality, and the individuals were followed a maximum of 7 years. I'd like to asses the discrimination ability of survival analysis Cox model by computing a ROC curve and area

Hi R-users, When I import a data base from SPSS with some variable with a name of more than 8 characters (which is possible in version 12 or later of SPSS software) I find that the name of these variables have been truncated to 8 characters. I used the 'read.spss' function from the 'foreign' package. Is there a function in R that solves this 'length variable names'

Hi, Anybody knows a function that can fit haplotype data to a Cox model. I've been searching it in the web without succeed. I use "haplo.stats" package, but unfortunatelly it's not possible to analyse survival data, amb I right?. Thanks in advance. Isaac Subirana (isubirana@imim.es) [[alternative HTML version deleted]]

Hi, Does anybody know how to obtain the same information as the SPSS command "DISPLAY DICTIONARY". I know the read.spss function in the package foreign, but it doesn't give either the missing values defined by the user under SPSS or the format variables (for example if they are dates or not). Thanks in advance. Isaac Subirana (isubirana@imim.es) [[alternative HTML

Hi, Does anybody know how to perform a Cox model analysis for right truncated data? All my data is right truncated, since I only have patients who entered in a hospital for a particular desease, and I would like to modelate the age at hospital entrance as the response variable. Thanks in advance. Isaac Subirana. isubirana@imim.es -------- La informació continguda en aquest missatge i

Hi everybody, Does anyone know a function to compute the attributable risk of a factor in a logistic regression or a proportional hazard cox model (both with confounding variables)? I need also obtain the confidence interval. Thanks in advance. Isaac Subirana. -------- La informació continguda en aquest missatge i en qualsevol fitxer adjunt és confidencial, privada i d'ús exclusiu

Hi, Does anybody know how to obtain the imputed SNP genotype probabilities from the snpStats package? I am interested in using an imputation method implemented in R to be further used in a simulation study context. I have found the snpStats package that seems to contain suitable functions to do so. As far as I could find out from the package vignette examples and its help, it gives the