You need to do the homework yourself. What is correct depends on what the data says,(and what exactly the prof wants). :) The best idea probably is to decide yourself on what you want to present and write a rationale as to why you chose this analysis.
More generally there is a lot of good documentation available on the R website although it is not always easy to get to. Try going to the R home page http://www.r-project.org/, then choose Other (left side of page) and then select contributed documentation. Something like “Using R for Data Analysis and Graphics - Introduction, Examples and Commentary” by John Maindonald or “Kickstarting R (version 1.6)” compiled by Jim Lemon should be helpful for ploting among other things. Have fun. --- On Sun, 11/23/08, Rlover <[EMAIL PROTECTED]> wrote: > From: Rlover <[EMAIL PROTECTED]> > Subject: [R] Is this correct? > To: r-help@r-project.org > Received: Sunday, November 23, 2008, 9:45 PM > 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. __________________________________________________________________ Get a sneak peak at messages with a handy read iew2/ ______________________________________________ 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.
