# R is a free software environment for statistical computing and graphics. It compiles and runs on a wide variety of UNIX platforms, Windows and MacOS. To download R, please choose your preferred CRAN mirror. # If you have questions about R like how to do
R first appeared in 1996, when the statistics professors Robert Gentleman, left, and Ross Ihaka released the code as a free software package.
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By ASHLEE VANCE
Published: January 6, 2009
The simple linear regression model considers the relationship between two variables and in many cases more information will be available that can be used to extend the model. For example, there might be a categorical variable (sometimes known as a covariate) that can be used to divide the data set to fit a separate linear
B. Gunjal, S. Urs, and H. Shi. In Proceedings of the WCECS 2008 – ICEIT'08 International Conference on Education and Information Technology 2008; San Francisco, USA, 22-24 October 2008, page 502 – 507. San Francisco, USA, WCECS 2008 – ICEIT'08, (22 - 24 10 2008)