Heat Map

[Jaime]

I usually use proc report with some conditional formatting to create heatmaps.
Is there a better way using any of the new graphics procs?

[Jay54]

With SAS 9.2, You can use SGPLOT procedure and / or GTL to do heat maps, however, you have to use a scatter plot and manage the size of the markers. See examples here:

http://support.sas.com/sassamples/graphgallery/PROC_SGPLOT.html
http://support.sas.com/kb/31/489.html
http://support.sas.com/kb/35/156.html

Looking ahead, we will have a real HEATMAP statement in GTL at V9.3.

[GraphGuy]

There are many kinds of charts people call "heat maps" - could you provide a link to an example (on the web) of the specific kind of heat map you're wanting to create?

[Jaime]

Here is a link to the type of heatmap. http://learnr.wordpress.com/2010/01/26/ggplot2-quick-heatmap-plotting/

Good to here GTL will get the heatmap function.
I've troed the examples above in the past and found the sizing of the scatter dots a bit messy.

[GraphGuy]

Ahh - so, really, just a grid of colored boxes, where you control the color.
I don't have any examples 'exactly' like yours, but here are some similar,
that could probably be adapted ...

http://robslink.com/SAS/democd22/heatmap.htm
http://robslink.com/SAS/democd22/heatmap_info.htm

The technique used in this custom calendar chart could be adapted:
http://robslink.com/SAS/democd22/trend.htm
http://robslink.com/SAS/democd22/trend_info.htm

http://robslink.com/SAS/democd21/emission.htm
http://robslink.com/SAS/democd21/emission_info.htm

A gplot, similar to the sgplot that was posted:
http://robslink.com/SAS/democd10/pltwafer.htm
http://robslink.com/SAS/democd10/pltwafer_info.htm

And, most of these 'wafer maps' could be adapted to a rectangular 'heat map':
http://robslink.com/SAS/democd10/aaaindex.htm