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

[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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