[R] Problem mit summaryBy: Group sums gives me "incorrectly" zero for one variable

[Werner Wernersen]

Just an additional note: It must be a problem with the
variable names. If I change "total.inf" to for
instance "ttotal.inf" then it works as expected. 

What is the rule here? I would like to avoid such
problems in the future.

Thanks,
  Werner

> Hi,
> 
> first I want to thank all of you for the quick aid
> which is provided here on the list during all times.
> Thanks a lot for that!
> 
> Then, I have a problem using summaryBy which most
> probably is a problem of wrong use by me or the
> like: 
> 
> I use this command:
> summaryBy(total+total.inf~gr, aE, FUN=sum)
> 
> where aE is a 
> > str(aE)
> 'data.frame':   127880 obs. of  16 variables:
>  $ gr            : num  2.02e+10 1.13e+10 2.15e+10
> 4.02e+10 1.04e+10 ...
>  $ total         : num  187714   5214   5214 260714 
> 
> 1304 ...
>  $ total.inflated: num  188806   5245   5245 262230 
> 
> 1311 ...
> .
> .
> .
> 
> Now, the resulting sum for total.inf per gr is
> perfectly fine but for the sum for total per gr I
> get
> only zeroes although they shouldn't be zero. 
> 
> Has anybody experienced a similar problem? What am I
> doing wrong?
> 
> Thank you very much for your help,
>   Werner
> 



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