Re: st: Map with wrong colors

[Maurizio Pisati <maurizio.pisati@unimib.it>]

Dear Friedrich,
when option -clmethod(unique) is specified, -spmap- generates the 
(internal) classification variable _class with the following command:
        egen _class = group(UNIQUEVAR), label lname(_class)
This way, only the valid values of UNIQUEVAR are kept and used for 
creating the choropleth map. If such valid values are just four, then 
variable _class will take only those four values and, therefore, only 
the first four colors specified in option -fcolor()- will be used. As 
suggested by Sergiy Radyakin in a previous message, as an alternative 
you might want to use your original variable (0-100 plus missing 
values) and specify options -clmethod(quantile)- and -clnumber(5): 
this should produce the result you're looking for.
Best,
Maurizio




At 00.05 06/09/2007, Friedrich Huebler wrote:

> When I draw a choropleth map with -spmap- from SSC, the regions have
> the wrong colors. I define a variable called "key" with the values 1
> to 6, recoded from a variable with the range 0 to 100 percent. 1 to 5
> identify quintiles and 6 identifies regions with missing data. My
> -spmap- command is shown below, with fill colors specified with RGB
> values.
>
> #delimit ;
> spmap key using map.dta,
>   id(id)
>   clmethod(unique)
>   fcolor("215 25 28" "253 174 97" "255 255 191" "171 217 233" "44 123
> 182" "225 225 225")
> ;
>
> None of the regions have a value below 20 and none have a value
> between 60 and 80, so that the first and fourth color in the list
> above ("215 25 28" = dark red and "171 217 233" = light blue) should
> not appear on the map. However, the map is drawn with the first three
> colors from the fcolor list instead of the second, third and fifth
> color. All regions with the value 2 are filled with the color "215 25
> 28", all regions with the value 3 are filled with the color "253 174
> 97", and all regions with the value 5 are filled with the color "255
> 255 191".
>
> What am I doing wrong?
>
> Friedrich
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