References/Notes/Attributions:
Source
National Opinion Research Center General Social Survey. GSS Cumulative Datafile 1972-2016, downloaded from http://gss.norc.org/.
References
Fox, J. (2016) Applied Regression Analysis and Generalized Linear Models, Third Edition. Sage.
Fox, J. and Weisberg, S. (2019) An R Companion to Applied Regression, Third Edition, Sage.