Hello R-Users,

 

I have the following problem with the subset function:

 

See the following simple linear model. Here everything works fine:

 

>germany<-lm(RENT~AGE1, in.mi01)

 

However, if a use the same regression equation and only specify a subset, I
get an error message:

 

> berlin<-lm(RENT~AGE1, in.mi01, subset=C_X01=="Berlin")

 

Error in lm.fit(x, y, offset = offset, singular.ok = singular.ok, ...) : 

        0 (non-NA) cases

 

 The datasets contains no missing values and for the city Berlin there are
2200 observations.

 

> summary(in.mi01$C_X01)

Berlin               Düsseldorf           Frankfurt am Main    Hamburg
Köln                 

                2200                 1638                 2943
2068                  759 

Leipzig              Munich               Others               Stuttgart


                 344                 1514                 7955
383

 

What am I doing wrong?

 

Thanks in advance for any help and suggestions,

 

Simon

 

 


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