On Wed, 7 Mar 2012 10:28:24 -0500, vivian v <v.vivian3@GMAIL.COM> wrote:

>Hi, all, >I have a data like the following: > >response group >1.23 A >2.34 A >3.24 A >5.46 B >4.34 B >........ > >Suppose I have 4 groups. How can I draw 4 density plots for each group and >overlay on one figure? Thanks!

You can use PROC UNIVARIATE to draw comparative histogram where each density is in its own panel.

To overlay them in a single plot: 1) Reshape the data so that each group becomes a variable, using the technique described in http://blogs.sas.com/content/iml/2011/11/04/reshape- data-so-that-each-category-becomes-a-new-variable/

2) Use SGPLOT to overlay the densities, using the technique shown in http://blogs.sas.com/content/iml/2012/01/13/overlay-density-estimates- on-a-plot/

If you also want histograms, see http://blogs.sas.com/content/graphicallyspeaking/2012/02/06/comparative- densities/

Rick Wicklin Statistical programming and SAS/IML blog: http://blogs.sas.com/content/iml