Re: st: RE: three mean and sd plots on the same graph?

[Joseph Wagner <joseph.wagner@wright.edu>]

Unfortunately I can't use over with -stripplot- since I can't combine 
()over with more than one variable and I have three that I wanted to 
compare side by side for each value of the X- axis categorical variable. 
by() won't work either for that matter since what I want is basically X 
over many Y as follows with a crude representation of my boxplot:


           |
           |   -             -        -             -
           |  +-+     -     +-+      +-+     -     +-+
           |  |-|    +-+    |-|      |-|    +-+    |-|
           |  +-+    |-|    +-+      +-+    |_|    +-+
           |   -     +-+     -        -     +-+     -
           |          -                      -
           +-------------------------------------------
             var_1  var_2  var_3    var_1  var_2  var_3
                    age=8                 age=9


I don't have access to the article Maarten referenced.




Nick Cox wrote:

> Now my best advice is to use -stripplot- from SSC. Its default is to
> show 
> strips of data points, but you can jitter or stack and add boxes or
> bars. 
> . sysuse auto
> (1978 Automobile Data)
> . stripplot trunk turn mpg, bar
>
> . stripplot trunk turn mpg, bar  
> . stripplot trunk turn mpg, bar vertical
>
> You can use a -by()- option as well. I'd recommend showing the data, 
> but you can blank it out with -ms(none)-. 
> By default the bars are offset from the data which may answer your 
> last question. 
> Joseph Wagner
>
> I created box plot graph with of 3 X variables over the same Y variable 
> but was then asked to produce a similar graph this time using mean (not 
> median) and +/- 95% CI.   I don't think Stata can do this but thanks to 
> a post by Nick three years ago, I was able to (sort of) create these:
>
> egen mean = mean(cont), by(cat) 
> egen sd = sd(cont), by(cat) 
> gen upper = mean + sd
> gen lower = mean - sd 
> scatter mean cat || rcap upper lower cat 
> . . .  is the example Nick gave but how would (or could I?) do this for
> three different X variables (in Nick's example I suppose it would be 3
> different 'cont' variables) on the same graph?  I can do 
> this for two but not 3 which brings me to my next problem: 
> The box plots I created earlier were each side by side for the same
> value of X (rather than on top of one another) but the two -rcap- graphs
> are on top of each other making it impossible to differentiate 
> the two lines (three would be even worse).  Is there a way to separate
> these lines or do I need to graph these data in another way altogether?
>
>
>
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