RE: st: adding lines to graph

[Roger Newson <roger.newson@kcl.ac.uk>]

At 11:36 20/05/03 -0400, Eldin Leighton
 wrote:
> To find the actual integer that corresponds to 9/11/2001, enter the command:
>
> display mdy(9,11,2001)
>
> Now, I believe you will get a vertical line plotted on your graph if you
> include
>
> xline(15229)
>
> since 15229 is the "date" integer corresponding to the date 9/11/2001.
>
> Hope this helps.
> Eldin

A package that might also help is my own -datelist-, downloadable from SSC. 
Type -ssc desc datelist- to find out more. -datelist- returns a list of 
dates in the return macro r(numlist), which the user may then use as a 
-xlabel- option in a -graph- command.

For instance, if -date- is a date variable, and -y- is another variable 
which varies with time, and the user wants an axis label at the first day 
of each month from 1 January 1999 to 1 Januart 2000, then s/he might type

datelist,fi(01/01/1999) la(01/01/2000) s2(mdy) unit(month)
graph y date,xlabel(`r(numlist)')

I hope this helps.

Roger



> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Neil Shephard
> Sent: Tuesday, May 20, 2003 10:44 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: adding lines to graph
>
>
> clara wrote...
> > I have a data set over a ten year period, and created a simple line graph
> to show the trend.  however, i want to add in vertical lines at certain time
> points to indicate when specific events occured that explain why the trend
> is moving a certain way.  for example, i want to add a line for
> september 11, to explain why employment might have dropped so drastically.
>
> This is for Stata 7.....
>
> man grsym
>
> reveals that you can add horizontal lines using yline and rline whilst
> vertical lines can be drawn using xline and tline.
>
> Hope thats of some help
>
> Neil
>
> Neil Shephard
> Genetics Statistician
> ARC Epidemiology Unit, University of Manchester
> neil.shephard@man.ac.uk
> neil.shephard@mindless.com
>
> "Contrariwise, if it was so, it might be; and if it
> were so it would be; but as it isn't, it ain't. That's
> logic" - Tweedledee (Alice Through the Looking Glass)
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--
Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
King's College London
5th Floor, Capital House
42 Weston Street
London SE1 3QD
United Kingdom

Tel: 020 7848 6648 International +44 20 7848 6648
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  or 020 7848 6605 International +44 20 7848 6605
Email: roger.newson@kcl.ac.uk

Opinions expressed are those of the author, not the institution.

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