Hi List,
I don't understand why 'lrm' doesn't recognize the '~.' formula. I'm pretty
sure it was working before. Please see below:
I'm using R2.3.0, WinXP, Design 2.0-12
thanks,
...Tao
> dat <- data.frame(y=factor(rep(1:2,each=50)), x1=rnorm(100), x2=rnorm(100),
> x3=rnorm(100))
> lrm(y~., data=dat, x=T, y=T)
Error in terms.formula(formula, specials = "strat") :
'.' in formula and no 'data' argument
> lrm(y~x1+x2+x3, data=dat, x=T, y=T)
Logistic Regression Model
lrm(formula = y ~ x1 + x2 + x3, data = dat, x = T, y = T)
Frequencies of Responses
1 2
50 50
Obs Max Deriv Model L.R. d.f. P C Dxy
Gamma
100 1e-08 3.61 3 0.3066 0.594 0.187
0.188
Tau-a R2 Brier
0.095 0.047 0.241
Coef S.E. Wald Z P
Intercept -0.05224 0.2071 -0.25 0.8009
x1 -0.30699 0.1952 -1.57 0.1159
x2 0.08093 0.2171 0.37 0.7093
x3 0.21450 0.2247 0.95 0.3398
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