R help - Jan 2011 - Creating a new variable from existing ones

Hi,

I am relatively new to R and have a question regarding code. I have a data set
which has data organised by location (site names, which are factors). I now want
to add a new variable Region (this will be non numerical, as it will be names).
Each region will contain locations. So for example:

Region: WestCoast
Locations in Region WestCoast: Tralee, Carradale and so on...

So each Region will contain different Locations, so that location can be nested
within Region if needed.

I have found info on how to create different Age categories for example but my
input is not numeric, but it is names or rather factors with a number of levels
(which are place names).

I would be grateful for any assistance you may be able to provide.

Thank you!
________________________________________
Melanie Zoelck
86 Gleann Na Ri 
Renmore
Galway
Ireland

Tel.: +353 91 746086
Movil/Mobile: +353 857246196
E-Mail: mzoelck@mail.infocanarias.com
	[[alternative HTML version deleted]]

On Jan 26, 2011, at 2:06 PM, Melanie Zoelck wrote:
> Hi,
>
> I am relatively new to R and have a question regarding code. I have  
> a data set which has data organised by location (site names, which  
> are factors). I now want to add a new variable Region (this will be  
> non numerical, as it will be names). Each region will contain  
> locations. So for example:
>
> Region: WestCoast
> Locations in Region WestCoast: Tralee, Carradale and so on...
Presumably you have some sort of table with "location" and
"region"
and another table with perhaps "persons" and "location". You
would
merge these two tables with ... wait for it .... "merge":

?merge


In the future it is considered more helpful to offer a tiny data  
example constructed with R code to allow more complete illustrations  
to be offered. Please read the Posting Guide.
>
> So each Region will contain different Locations, so that location  
> can be nested within Region if needed.
>
> I have found info on how to create different Age categories for  
> example but my input is not numeric, but it is names or rather  
> factors with a number of levels (which are place names).
>
> I would be grateful for any assistance you may be able to provide.
>
> Thank you!
> ________________________________________
> Melanie Zoelck
> 86 Gleann Na Ri
> Renmore
> Galway
> Ireland
>
David Winsemius, MD
West Hartford, CT