Simple introduction to linear models in R

It was hard for me to understand linear models in R. There are a lot of documents for the case, but many of them are technical manuals rather than teaching the concept.

I found this article really simple and instructive, I hope it would be useful for the other people who have the same problem.

Do you have any better suggestion?

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What you have supplied is a chapter from a book. Prescinding from the question of whether you have violated copyright by posting it, it would at least be a courtesy to the author to supply a citation. –  Placidia Oct 6 '12 at 15:39

I've spent a lot of time looking through R manuals. The best one that I've seen is Grant Farnsworth's "Econometrics in R". Check it out: http://cran.r-project.org/doc/contrib/Farnsworth-EconometricsInR.pdf. It's concise, but quickly covers a broad range of topics. The article you found looks good too!

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1. Hamilton, "Low-Tech Causal Modeling", 2008
2. Diez et al., "Introduction to linear regression" ch. 11 in OpenIntro Stats, 2nd ed., 2012
3. Gelman and Hill, ch. 3-4 in Data Analysis Using Regression and Multilevel/Hierarchical Models, 2007
4. McIntosh, “Doing” Applied Econometrics”, c. 2010

That's probably a bit more than a hundred pages, with roughly half the content from Gelman and Hill, who use R. I realize the book is not free, though.

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