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st: histogramm and dates

From   "Grote, Veit Dr." <>
To   <>
Subject   st: histogramm and dates
Date   Thu, 7 Aug 2003 16:34:34 +0200

Hello all,
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. How could I accomplish this? 
Thanks a lot
Veit Grote

Dr. Veit Grote, MSc
Klinikum der Universität München
Dr. v. Haunersches Kinderspital
Lindwurmstr. 4
D-80337 München
Tel.: +49 (89) 5160-7798
Fax: +49 (89) 5160-2951

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