Thanks, exemples are always helpful! But.. This happens:
. tab experiment treatment
| treatment
experiment | C E H L M |
Total
-----------+-------------------------------------------------------+--------
--
1 | 53 58 0 48 59 |
218
2 | 58 54 65 61 60 |
298
-----------+-------------------------------------------------------+--------
--
Total | 111 112 65 109 119 |
516
. tostring experiment treatment, gen (expstr treatstr)
expstr generated as str1
treatment already string; no generate
. gen combi = expstr + treatstr
treatstr not found
r(111);
. twoway (area all dos, sort) (area dead dos, sort), by(combi, cols(2)
holes(2 4) )
variable combi not found
r(111);
On 7/3/07 12:08 PM, "Maarten buis" <[email protected]> wrote:
> --- Maarten buis <[email protected]> wrote:
>> Yes, I would start with making a single variable which contains the
>> allowed combinations (use -tostring- to transform experiment into a
>> string variable, and create the newvariable with -gen newvar =
>> experiment + treatment-) then use the holes option to create the
>> hole.
>
> An example is probably helpful:
>
> *------------- begin example --------------
> sysuse auto, clear
> tab rep78 foreign
> tostring rep78 foreign , gen(repstr forstr)
> gen combi = repstr + forstr if rep78 < .
> twoway scatter mpg wei, by(combi, cols(2) holes(2 4))
> *------------- end example ----------------
> (For more on how to use examples I sent to the Statalist, see
> http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
>
>
> Hope this helps,
> Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room Z434
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
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