[R] histogram

David Winsemius dwinsemius at comcast.net
Mon Feb 6 18:31:23 CET 2012

On Feb 6, 2012, at 12:23 PM, Francis Keyes wrote:

> Thanks.  How do you suggest I use the reference population?  Sorry,  
> I'm new to R and just don't see it.  If i can get a plot that is  
> counts or density relative to my reference data it would be ideal.

It is difficult to specify "how" when we have no "what". The "what" is  
your responsibility, not ours. My thought was to use the ratio of the  
results of hist() on the two populations  which would then be offered  
back to hist or barplot. ....which (of course) requires that the  
'breaks'  be the same. Provide an example of your R representations of  
the reference population and tested population and all will become  

(And learn to post in plain text, please.)
David Winsemius, MD
West Hartford, CT
> On Mon, Feb 6, 2012 at 1:12 AM, David Winsemius <dwinsemius at comcast.net 
> > wrote:
> On Feb 5, 2012, at 8:31 PM, Francis Keyes wrote:
> With R and the hist function, is there a way to make a histogram in  
> which
> the y axis denotes propotion with respect to a separate sample  
> dataset of
> the same range instead of frequency?
> hist() returns an object with both "counts" and "density". If you  
> had a reference population it should be a fairly simple matter to  
> use one or the other of those.

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