Fox, J., and Weisberg, S. (2011). An R Companion to Applied Regression. 2nd Edn. Thousand Oaks, CA: Sage.
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Fox, J.; Weisberg, S. An R Companion to Applied Regression. Available online: https://us.sagepub.com/en-us/nam/an-r- companion-to-applied-regression/book246125 (accessed on 21 March 2023).
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