Message-ID: <CAAb4XW18x1SSHihrtZnwLFtLkOOLX+nLsQMJjMfFdyFxojje4A@mail.gmail.com>
Date: 2015-04-23T17:23:24Z
From: Mark Drummond
Subject: Predictions on training set shorter than training set
Hi all,
Given a simple logistic regression on a training data set using glm,
the number of predicted values is less than the number of observations
in the training set:
> fit.train.pred <- predict(fit, type = "response")
> nrow(train)
[1] 62660
> length(fit.train.pred)
[1] 58152
>
As a relative newcomer, I've run lots of simple glm, CART etc. models
but this is the first time I have seen this happen.
Is this a common issue and is there a fix? An option to predict() perhaps?
--
Cheers, Mark
Mark Drummond
mark at markdrummond.ca
When I get sad, I stop being sad and be Awesome instead. TRUE STORY.