R help - Jul 2013 - Use R for data aggregation

I have a set of evaluation variables (n) for each sample (sample size is
large enough) and I am trying to use R (nnet package) to aggregate the data.
However, I don't know the weight for each variable (I am sure the weight
shouldn't be equally assigned). Specifically, I have 12 indices (CO2, SO2,
TSP...) for 100 cities and I want to calculate weight for each and finally
obtain a comprehensive index and rankings for the cities. 

Could anyone give me an idea how can I realize this? Thank you very much.  



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nntx <sheldon.qiu at okstate.edu> wrote:
>I have a set of evaluation variables (n) for each sample (sample size
>is
>large enough) and I am trying to use R (nnet package) to aggregate the
>data.
>However, I don't know the weight for each variable (I am sure the
>weight
>shouldn't be equally assigned). Specifically, I have 12 indices (CO2,
>SO2,
>TSP...) for 100 cities and I want to calculate weight for each and
>finally
>obtain a comprehensive index and rankings for the cities. 
>
>Could anyone give me an idea how can I realize this? Thank you very
>much.  
>
>
>
>--
>View this message in context:
>http://r.789695.n4.nabble.com/Use-R-for-data-aggregation-tp4671384.html
>Sent from the R help mailing list archive at Nabble.com.
>
>______________________________________________
>R-help at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.