Displaying 2 results from an estimated 2 matches for "exphealth".
2012 Sep 25
3
Plotting of regsubsets adjr2 values not correct
Hi,
I want to make model selection with regsubsets. My code is:
a<-regsubsets(Gesamt ~ CommunistSocialist + CountrySize + GNI + Lifeexp +
Schoolyears + ExpMilitary + Mortality +
PopPoverty + PopTotal + ExpEdu + ExpHealth, data=olympiadaten, nbest=2)
summary(a)
plot(a,scale="adjr2")
(output attached)
The problem is now, that I want to fit the best model again "manually" and
have a look at it, but the value of the adjusted R squared is not the same
as in the regsubsets output? This is also the c...
2012 Sep 25
2
Regsubsets model selection
...pendent variables and one dependent variable. Now I want to
select the best adj. R squared model by using the regsubsets command, so I
code:
> plot(regsubsets(Gesamt ~ CommunistSocialist + CountrySize + GNI + Lifeexp
+ Schoolyears + ExpMilitary + Mortality +
+ PopPoverty + PopTotal + ExpEdu + ExpHealth, data=olympiadaten, nbest=1,
nvmax=12), scale='adjr2')
Then I get the picture I attached. The problem is, that the best model has
an adjusted R squard of 0.49. But if I regress e.g. my y on only the
variable PopTotal, then I already get an adjusted R squared of 0.779! So
this simple model...