[R] id & filter problems in data.frame

[vito muggeo]

> Hi,
> a questionaire data-set with more than one row for one Person make
> me problems.
>
> (1) i want create a function which count the used
> row for the relevant id !
> example:
> id  c.row
> 1    1
> 1    2
> 1    3
> 2    1
> 2    2
> 4    1
> 4    2
> 4    3
> 4    4
> 4    5

If I understand what you are looking for:
tapply(c.row,id, length)


> (2)  i have got a problem to filter & analyse , because the filter
> criteria is unlucky
> a row above or under the ratings which i would like to analyse !
>
> Thanks for any suggestions/starting point
> Christian Schulz
>
>
>
>
>
> Metrinomics GmbH
> Fon: +49 (0)30  69 51 71 - 16
> Fax: +49 (0)30  69 51 71 - 33
> mailto:c.schulz at metrinomics.de
> http://www.metrinomics.de
>
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