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Re: st: Three-way (or more) histograms in Stata


From   Austin Nichols <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Three-way (or more) histograms in Stata
Date   Tue, 9 Oct 2012 10:45:06 -0400

Tim Evans <Tim.Evans@wmciu.nhs.uk>:
See also -byhist- on SSC.

On Tue, Oct 9, 2012 at 9:45 AM, Tim Evans <Tim.Evans@wmciu.nhs.uk> wrote:
> Hi all,
>
> I am trying to generate histograms (in Stata 11.2) with age distributions for three categories overlaid in the same graph for different periods. Essentially I want to visually check whether the age distribution of the cohort in an age group changes between periods, and whether the distribution of sub groups of the population also change.
>
> I started off with -histogram- because this nicely collapses my patient level data, without me having to do this manually. However, while I found twoway to be an option to increase the number of series plotted on the graph, I guess what I'm really after are line plots which would allow transparency between the series.
>
> I'm using the followinhg code to present single categories of interest (but for each level in my age group) and use the -by()- to present all periods on one combined graph (separate for each age group)

> My questions are:
>
> Can I ask -histogram- to plot lines rather than bars?
> Can -histogram- (with lines if possible) plot more than 2 series of data
>
> If -histogram- will not do this, what is a better method of doing this?

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