Re: st: graphing median values against time

[Nick Cox <njcoxstata@gmail.com>]

Timothy explains how to do that in the help.

    addplot(plot) This allows additional twoway plots to be plotted.
See addplot_option. Note that
        because lgraph collapses the data before plotting in twoway,
plots given in addplot(plot)
        should also refer to the collapsed data. Specify in
alsocollapse(clist) any additional data
        that need to be collapsed.

So, if you want median as well as mean you must specify

alsocollapse(median) addplot(<whatever>)

Note that nothing obliges you to use another -line- call.

I haven't use -lgraph-, just looked at its help, but Timothy provides
lots of functionality.
Nick
njcoxstata@gmail.com


On 30 March 2014 23:51, Donald Spady <dspady@ualberta.ca> wrote:
> Timothy
>   I am using your -lgraph- command and wonder if it is possible to have TWO stats created (e.g. mean and median) for the same variable(s) at the same time.  I want to plot both mean and median and cannot create an overlay to do so.
>
> Many thanks
> Don
> On Mar 28, 2014, at 1:29 AM, Timothy Mak <tshmak@hku.hk> wrote:
>
>> The command -lgraph- that I wrote is for exactly this kind of problem if you don't want to create all the variables before plotting a graph.
>> You can see it by typing:
>> ssc des lgraph
>>
>> Tim
>>
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Donald Spady
>> Sent: 28 March 2014 08:59
>> To: Statalist Statalist
>> Subject: Re: st: graphing median values against time
>>
>> Nick
>>  It works.  Just as I needed. Many thanks.
>> John: That suggestion didn't work the way I wanted it to, but thanks for the idea.
>>
>> Don
>> On Mar 27, 2014, at 5:48 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>>
>>> Sure. If you use -egen-'s -median()- and -mean()- functions to get the
>>> variables you want, then it's any graph you want.
>>>
>>> As the median and mean values are repeated, don't plot them repeatedly.
>>>
>>> Here are some dopey examples.
>>>
>>> . webuse grunfeld
>>>
>>> . egen median = median(invest), by(year)
>>>
>>> . egen mean = mean(invest), by(year)
>>>
>>> . egen tag = tag(year)
>>>
>>> . line mean median year if tag
>>>
>>> For finer subdivisions, just use more variables as arguments to -by()-.
>>>
>>> Nick
>>> njcoxstata@gmail.com
>>>
>>>
>>> On 27 March 2014 22:34, Donald Spady <dspady@ualberta.ca> wrote:
>>>> Dear all
>>>> I want to graph the median and mean values of a series of variables against a time variable (on the X axis) and with the option of stratifying the variables by another one (such as sex or disease state).  I think I can do this by collapsing the data but is it possible to do this while retaining the data set in its 'original' state.  I have searched the archives and the reference manuals but have not come up with anything that seems to be what I want.
>>>> In many ways what I would like is a box plot with JUST the median (or mean) being plotted: no box, no outliers.  Is that possible.
>>>>
>>>> Thanks
>>>> Don
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