R help - Aug 2009 - Select subset with specific distribution parameters.

This may be a simple problem, but I am looking to select a subset of rows
from a dataframe that will have the same parameters as all the rows in
another dataframe. 

e.g. I have a 500 row dataframe with 20 columns. I want to select a subset
of rows from a larger dataframe that match the distribution of values for
one or more of the columns within the 500 row dataframe (i.e. within same
range, but also having same mean/median and overall shape). 

By basic subsetting I can get a set with a similar approximate distribution
to the 500 row dataset, but not highly similar, and this might be a problem
for the analysis. Any help would be much appreciated, thanks.

-- 
View this message in context:
http://www.nabble.com/Select-subset-with-specific-distribution-parameters.-tp24848201p24848201.html
Sent from the R help mailing list archive at Nabble.com.

Could you provide a reproducible example?

On Thu, Aug 6, 2009 at 10:59 AM, sedm1000<gdoran at mit.edu>
wrote:
>
> This may be a simple problem, but I am looking to select a subset of rows
> from a dataframe that will have the same parameters as all the rows in
> another dataframe.
>
> e.g. I have a 500 row dataframe with 20 columns. I want to select a subset
> of rows from a larger dataframe that match the distribution of values for
> one or more of the columns within the 500 row dataframe (i.e. within same
> range, but also having same mean/median and overall shape).
>
> By basic subsetting I can get a set with a similar approximate distribution
> to the 500 row dataset, but not highly similar, and this might be a problem
> for the analysis. Any help would be much appreciated, thanks.
>
> --
> View this message in context:
http://www.nabble.com/Select-subset-with-specific-distribution-parameters.-tp24848201p24848201.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.
>


-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis

I'm sorry, an example needed a lot of data, hence I skipped it.

I've settled for taking random sets from within a defined range to simulate
the potential distributions and to calculate a rough significance value from
that...

Thanks for your help.
-- 
View this message in context:
http://www.nabble.com/Select-subset-with-specific-distribution-parameters.-tp24848201p24891867.html
Sent from the R help mailing list archive at Nabble.com.