Hi David,

I have 2 tables, each with several columns and rows of data.  I am
only interested in the data from column 6, which contains values in
the range -PI to PI.  I want to plot the data from tableD with the y
axis denoting percentage with respect to tableR.  So if data points in
the break 2 - 3 appear half as often in tableD as in tableR, the y
axis should show 50 percent.  Does that make sense?
I've been plotting the data like this to date:

hist(tableD[,6],ylab="frequency", xlab="angle")

Thanks a lot for your help



On Mon, Feb 6, 2012 at 1:31 PM, David Winsemius <dwinsem...@comcast.net> wrote:
>
>
> 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 clear.
>
> (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 <dwinsem...@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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