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2003 Oct 01
1
question about predictions with linear models
...uestion is probably very obvious but I just cant see where I might be going wrong. I'm using the lm() function to generate a linear model and then make predictions using a different set of data. To generate the model I do (tdata & pdata are matrices of observations and parameters, tdepv, pdepv are response vectors) x <- as.data.frame(tdata) x$tdepv <- tdepv lnegth(tdepv) = 140 model <- lm(x$tdepv ~ x$V1 + x$V2 + x$V3 + x$V4, x) pred <- predict(model, x) length(pred) = 140 y <- as.data.frame(pdata) y$pdepv <- pdepv length(pdepv) = 16 pred <- predict(model, y) len...