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Re: st: Graph Mean SD of continuous variable over categorical variable - but with a twist


From   Lars Folkestad <lfolkestad@health.sdu.dk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Graph Mean SD of continuous variable over categorical variable - but with a twist
Date   Tue, 25 Oct 2011 11:25:20 +0200

That did the trick. Thank you!
lars

Den 25/10/11 10.32 skrev "Nick Cox" <njcoxstata@gmail.com>:

>See also
>
>http://www.stata.com/statalist/archive/2011-09/msg01293.html
>
>for an answer on 28 September to what seems like the same question,
>just asked differently.
>
>Nick
>
>On Tue, Oct 25, 2011 at 8:58 AM, Nick Cox <njcoxstata@gmail.com> wrote:
>> See also
>>
>> SJ-5-4  gr0023  . . . . Stata tip 27: Classifying data points on
>>scatter plots
>>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N.
>>J. Cox
>>        Q4/05   SJ 5(4):604--606                                 (no
>>commands)
>>        tips for using separate, gray-scale gradation, and text
>>        characters as class symbols to classify data points on
>>        a scatter plot
>>
>> for technique relevant to the "for each group" part of the question.
>> In a sentence, use -separate- to separate the response into different
>> variables.
>>
>> Nick
>>
>> On Tue, Oct 25, 2011 at 8:35 AM, Maarten Buis <maartenlbuis@gmail.com>
>>wrote:
>>> On Tue, Oct 25, 2011 at 9:02 AM, Lars Folkestad wrote:
>>>> I am trying to depict the differences in mean+-SD of two continuous
>>>> Variables over a categorical variable <snip>
>>>> scatter mean cat || rcap upper lower cat
>>> <snip>
>>>> But this does not give me the option to change the colour of the
>>>> Mean (dot) or the SD (bars) for each group, which visually would
>>>> Be preferable.
>>>
>>> It does give you that possibility, you just need to find the right
>>> options. That command consists of two parts separated by -||-. The
>>> first part graphs mean against the categorical variable and the second
>>> graphs the standard deviation bars against the categorical variable.
>>> To find the options possible after the first command type in Stata
>>> -help twoway scatter- and to find the options possible after the
>>> second command type in Stata -help twoway rcap-. In the example below
>>> I give a silly (and extremely ugly) example of how you can change the
>>> way your graph looks:
>>>
>>> *--------------------- begin example ----------------------
>>> sysuse auto, clear
>>> egen mean = mean(price) , by(rep78)
>>> egen sd = sd(price), by(rep78)
>>> gen upper = mean + sd
>>> gen lower = mean - sd
>>>
>>> scatter mean rep78 ,        /// plots the mean against rep78
>>>    msymbol(S)              /// change the symbol to a solid square
>>>    msize(huge)             /// make the marker size huge
>>>    color(purple)           /// change the color of the symbol to purple
>>>    ||                      /// start a new overlay graph
>>>    rcap upper lower rep78, /// plots the standard deviation against
>>>rep78
>>>    lpattern(longdash)      /// make the line dashed
>>>    lwidth(thick)           /// make the line thick
>>>    lcolor(pink)            //  make the the line pink
>>> *---------------------- end example -----------------------
>>> (For more on examples I sent to the Statalist see:
>>> http://www.maartenbuis.nl/example_faq )
>>>
>>
>
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