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st: RE: histogramm and dates


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: histogramm and dates
Date   Thu, 7 Aug 2003 15:54:43 +0100

Dr Veit Grote, MSc 

> I have cases that were detetcted between the 1st May 1997 
> and the 19th June 2001 (d_onset). I like to have a 
> histogram of the distribution of the number of cases by 
> month, showing also the months with missing values, i.e. I 
> like to have a true time scale. I could not find out how I 
> could accomplish this. I tried (arbitrarily choosing 50 bins):
> 
> histogram d_onset, bin(50) frequency xlabel(#50, 
> angle(vertical) format(%dmy))
> 
> This gives me an idea of the general distribution, but the 
> bins are not months. If I create a new variable grouping 
> all cases per month and year, I could have a bar graph with 
> correct numbers per month, but time gaps would not show. 

I am not clear what the problem is. Did you convert 
to a month variable and try a histogram? I would 
go 

gen m_onset = mofd(d_onset) 
histogram m_onset, w(1) 

etc. 

Nick 
n.j.cox@durham.ac.uk 
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