Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: st: Using Median for scatter plot


From   "Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Using Median for scatter plot
Date   Thu, 12 Apr 2012 08:21:40 -0700

if you have observations that are below the limit of detection (LOD) you need to account for them in the distribution.  A recent article is by
Gillespie, B. W., Chen, Q. REichert, H. , Franzblau, A., Hedgeman, E., Lepkowski, J., Adriaens, P., Demond, A., Luksemburg, W., and Garabrant, D. H. "Estimating Population Distributions When Some DAta 
Are Below a Limit of Detection by Using a REverse Kaplan-Meier Estimator" _Epidemiology_ v.21 (4) July Supplement 2010  S64-S70.
It might be nice to see this in Stata.

Tony


________________________________________
From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten Buis [maartenlbuis@gmail.com]
Sent: Wednesday, April 11, 2012 6:47 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Using Median for scatter plot

On Wed, Apr 11, 2012 at 3:30 PM, Oybek wrote:
> I need to make two way scatter plot using continuos variable (hormone levels) and age in stata 12. I have around 2000 observations. Is there a command which allows using median hormone levels (instead of mean) for each age?

*--------- begin example -----------
sysuse nlsw88, clear
bys grade: egen med = median(wage)
by grade : gen byte mark = _n == 1
twoway scatter wage grade || ///
       line med grade if mark, sort
*---------- end example ------------
(For more on examples I sent to the Statalist see:
http://www.maartenbuis.nl/example_faq )

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany


http://www.maartenbuis.nl
--------------------------
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index