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...D, MCS Resident - Department of Internal Medicine University of Virginia, Charlottesville, Virginia ------------------ ######################################################## # Compute the Hosmer-Lemeshow 'goodness-of-fit' test cd.full_model = glm(formula = Collaterals ~ CHF + Age + CABG + relevel (as.factor (num.obst.vessels),"one") + Current.smoker + DM + HTN + ace.inhibitor + MI, family = binomial(link = "logit")) hosmerlem = function(y, yhat, g=10) { cutyhat = cut(yhat, breaks = quantile(yhat, probs=seq(0, 1, 1/g)), include.lowest=TRUE)...

I am analyzing data on a study of the effects of Coronary Artery Bypass Graft (CABG) on cognitive function, as measured by a score from an objective test. I have 140 people who receive the CABG surgery and 92 controls, with four measurements of cognitive function over time (at 0, 3, 12 and 36 months). I have fitted a linear mixed model using lme with a random intercept for subje...

I am new to R, and I am trying to cut a continuous variable BMI into different categories and can't figure out how to use it. I would like to cut it into four groups: <20, 20-25, 25-30 and >= 30. I am having difficulty figuring the code for <20 and >=30? Please help. Thank you. -- View this message in context:

Dear All, I would like to find something ( references, code,..) to implement a comparison of three treatments in an observational study using the 'Propensity Score'. Any help is much appreciated. Thanks! Giovanni -- dr. Giovanni Parrinello Department of Biotecnologies Medical Statistics Unit University of Brescia Viale Europa, 11 25123 Brescia email: parrinel at med.unibs.it Phone:

In the course of tracking down a problem in Samba v2.0.4a, I set "debuglevel=3" and noticed something strange in the log file. While attempting to find the netlogon script, a number of variations on the name are tried (e.g. for Windows, it's *.COM, *.EXE, *.BAT). Here's the strangeness: the file NETLOGON"BAT is also looked for. Yes, that's a quotation mark in place

I am trying to create a frequency distribution and I am a bit confused. Here are the commands I have entered: > data <- read.csv(file="40609_sortedfinal.csv",head=TRUE,sep=",") > NumberOfActionsByStatus = data$STATUS > NumberOfActionsByUser = data$ETS_LOGIN > NumberOfBidOffer = data$BID_OFFER > NumberOfActionsByUser.freq = table(NumberOfActionsByUser) >