[R] stepAIC problem

[A.J. Rossini]

"Hiroto Miyoshi" <h_m_ at po.harenet.ne.jp> writes:

> Could anyone help me please?
>
> --small example
>> library(MASS)
>> x1<-runif(100)
>> x2<-runif(100)
>> x3<-runif(100)
>> x4<-runif(100)
>> x5<-runif(100)
>> y<-x1+x2+x3+runif(100)
>> t<-data.frame(y=y,x1=x1,x2=x2,x3=x3,x4=x4,x5=x5)

It is going to be very unhappy if it tries to call the t() transpose
function.   Please rename this variable and try again.

>> x<-lm(y~x1+x2+x3+x4+x5,data=t)
>> stepAIC(x)
> Start:  AIC= -247.61
>  y ~ x1 + x2 + x3 + x4 + x5
>
>        Df Sum of Sq      RSS      AIC
> - x5    1 3.747e-06    7.456 -249.608
> - x4    1     0.026    7.483 -249.254
> <none>                 7.456 -247.609
> - x1    1     4.866   12.322 -199.375
> - x2    1     8.182   15.639 -175.543
> - x3    1     8.597   16.054 -172.922
> Error in as.data.frame.default(data) : can't coerce function into a
> data.frame


best,
-tony

-- 
rossini at u.washington.edu            http://www.analytics.washington.edu/ 
Biomedical and Health Informatics   University of Washington
Biostatistics, SCHARP/HVTN          Fred Hutchinson Cancer Research Center
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