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Notes
- 1.
If you import data that are decimal comma separated with the default settings (i.e., with decimal point separation) or vice versa, R will see all variables as factors, and the strcommand will tell you so. Hence, to check that data were imported correctly, we recommend always using the str command on the imported data frame immediately after importing the data.
- 2.
A mixed effects model is an extension of linear regression.
- 3.
A sex/year interaction term allows the effect of sex to differ over the years.
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© 2009 Springer Science+Business Media, LLC
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Zuur, A.F., Ieno, E.N., Meesters, E.H.W.G. (2009). Simple Functions. In: A Beginner’s Guide to R. Use R!. Springer, New York, NY. https://doi.org/10.1007/978-0-387-93837-0_4
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DOI: https://doi.org/10.1007/978-0-387-93837-0_4
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