[R] dataframe

[Dimitri Liakhovitski]

It's not very clear from what you pasted into your message what your
data frame looks like.
Does it always have 2 lines per record or just one?
Also - in what format is your YEAR?

On Wed, Apr 21, 2010 at 9:54 AM, n.vialma at libero.it <n.vialma at libero.it> wrote:
> Dear list,
> I have a question about the selection of Variables in dataframes.
> I have a dataframes like this:
>
> CFISCA                       FIRMS
> YEAR                    VAR               VALUE
> 20345                            nike
> 2005                       EC01                 34
> 20345                            nike
> 2006                      EC01                   45
> 56779                           mediaset
> 2005                       EC01                 65
> 64568                           agazzini
> 2005                       EC01                  78
> 64568                           agazzini
> 2006                        EC01                   56
> 78907                           uniteam
> 2006                         EC01                    46
>
>
> what my result should be is a new dataframes which have only firms which have
> data in both years (2005,2006)
>
> CFISCA                       FIRMS
> YEAR                    VAR               VALUE
> 20345                            nike
> 2005                       EC01                 34
> 20345                            nike
> 2006                      EC01                   45
> 64568                           agazzini
> 2005                       EC01                  78
> 64568                           agazzini
> 2006                        EC01                   56
>
>
> Thanks for your attention!!!
>
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-- 
Dimitri Liakhovitski
Ninah.com
Dimitri.Liakhovitski at ninah.com