[R] Is this correct?
Rlover
lmoto001 at fiu.edu
Mon Nov 24 03:45:55 CET 2008
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 :)
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