[R] help with prediction of GLM

penny77114 penny77114 at gmail.com
Fri Nov 7 16:45:10 CET 2008

So, I have training data, and testing data

however, when I try to predict values for the testing data, it gives me
values for the training data. what gives? 

the following is my code:

train = read.table(train.txt, header = TRUE, sep = " ")
test = read.table(test.txt, header = TRUE, sep = " ")
model = glm(formula = train[,10]~ train[2] + train[3] + ... + train[9],
family = binomial("logit"))
pred = predict(model, newdata = test.txt, type = "response")

and then I get an warning: 
"Warning messages:
1: 'newdata' had 45014 rows but variable(s) found have 45001 rows 
2: In predict.lm(object, newdata, se.fit, scale = 1, type = ifelse(type == 
  prediction from a rank-deficient fit may be misleading

and it seems it's not reading the newdata at all, as the pred is exactly the
same whether I put 
pred = predict(model, newdata = test.txt, type = "response")
pred = predict(model, type = "response")

thanks in advance for any help
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