I have to answer the following question for a homework assignment. A researcher was interested in whether people taking part in sports at university made more money after graduating, taking into account the students' GPA. They sampled 200 alumni from a large university. The variables are: income (income 10 years after graduating), sports (1 if they did sports, 0 if they did not), and GPA (the grade point average at university). Discuss the relationship between taking part in sports, GPA, and income for these data.
The R code I used so far is Does sports predict GPA? > lm1<-lm(GPA~sports) > summary(lm1) Does sports predict income? > lm2<-lm(income~sports) > summary(lm2) Does GPA predict income? > lm3<-lm(income~GPA) > summary(lm3) Does sports predict income after accounting for GPA? > lm4<-lm(income~GPA+sports) > summary(lm4) Can someone let me know is the above is correct? I am not sure if to keep all four regressions or only 1 and 4. Also, I need to plot the data on a graph or table. Can anyone suggest how to do this? Thank you in advance :) -- View this message in context: http://www.nabble.com/Is-this-correct--tp20654004p20654004.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
