Non-graphical linearity estimation

Posted by aL3xa on Stack Overflow See other posts from Stack Overflow or by aL3xa
Published on 2010-06-10T11:06:20Z Indexed on 2010/06/10 13:12 UTC
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In my previous post, I was looking for correlation ratio (η or η2) routines in R. I was surprised by the fact that no one uses η for linearity checking in the GLM procedures.

Let's start form a simple example: how do you check linearity of bivariate correlation? Solely with scatterplot?

There are several ways of doing this, one way is to compare linear and non-linear model R2, then to apply F test to seek for significant difference between them.

Finally, the question is: How do you check linearity, the "non-grafical" way?

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