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Re: st: -tmap- maps: why only 9 categories?


From   smerryman@kc.rr.com
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -tmap- maps: why only 9 categories?
Date   Wed, 23 Aug 2006 10:47:44 -0500

Friedrich,

Keep in mind that -tmap- calls colorscheme.dta to determine the color 
palette and colorscheme.dta only has a maximum of 9 categories for 
each scheme.  Of course you could add more colors to each scheme to 
have more than 9 distinct categories.

With 10 categories are all the regions colored?

Scott


----- Original Message -----
From: Friedrich Huebler <huebler@rocketmail.com>
Date: Wednesday, August 23, 2006 10:17 am
Subject: st: -tmap- maps: why only 9 categories?
To: statalist@hsphsun2.harvard.edu

> Choropleth maps created with -tmap- from SSC are limited to 9
> categories by default. Quote from the -tmap- help file: "clnumber(#)
> specifies the number of classes k in which the variable of interest
> quantvar should be divided. This option accepts only numbers between
> 2 and 9."
> 
> I had to create a map with 10 classes and was able to do so by
> editing tmap_choropleth.ado in two places.
> 
> Line 103: change "if r(r) > 9" to "if r(r) > 10"
> Line 110: change "inrange(`clnumber', 2, 9)" to "inrange(`clnumber',
> 2, 10)"
> 
> I can only think of aesthetic reasons for a limit on the number of
> categories in a map. Is there also a technical reason for the 9-class
> limit of -tmap-? Could raising this limit cause problems with -
> tmap-
> or with Stata?
> 
> Friedrich Huebler
> 
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