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Re: st: twoway bar


From   ofran almossawi <ofran.almossawi@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: twoway bar
Date   Wed, 28 Mar 2012 14:23:56 +0100

very many thanks to you
i shall try it today.

On 28 March 2012 13:58, Nick Cox <njcoxstata@gmail.com> wrote:
> In the case of the code below
>
>  graph bar (mean) trunk turn, over(foreign)
>
> is a more direct approach. But you still need -twoway- to plot your
> means and confidence intervals.
>
> Also, if in your code -group- is the x variable, then -by(group)- is
> usually better omitted.
>
> Nick
>
> On Wed, Mar 28, 2012 at 1:49 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>> In each of your graph calls, you specify that -group- defines the x
>> axis variable; inevitably -twoway- does exactly what you ask for and
>> plots bars etc. on top of each other.
>>
>> You may be expecting default behaviour like that of -graph bar-, but
>> -twoway bar- does not behave in the same way,
>>
>> One way round this is to use an offset. The following gives an example
>>
>> sysuse auto, clear
>> egen mean_turn = mean(turn), by(foreign)
>> egen mean_trunk = mean(trunk), by(foreign)
>> label var mean_turn "Mean of Turn circle, ft"
>> label var mean_trunk "Mean of Trunk space, cu. ft"
>> gen foreign1 = foreign - 0.1
>> gen foreign2 = foreign + 0.1
>> twoway bar mean_turn foreign1 , barw(0.18) ///
>> || bar mean_trunk foreign2, barw(0.18) xtitle("`: var label foreign'")
>> base(0) xla(0 "Domestic" 1 "Foreign")
>>
>> See also
>>
>> SJ-7-1  gr0026  . . . .  Stata tip 42: The overlay problem: Offset for clarity
>>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J. Cui
>>        Q1/07   SJ 7(1):141--142                                 (no commands)
>>        tip for graphing several quantities on a continuous axis
>>
>> which is accessible to all at
>>
>> http://www.stata-journal.com/sjpdf.html?articlenum=gr0026
>>
>> Nick
>>
>> On Wed, Mar 28, 2012 at 1:29 PM, ofran almossawi
>> <ofran.almossawi@gmail.com> wrote:
>>
>>> I have done a two way bar plot but stata keeps stacking the bars and the sd
>>> lines on top of each other instead of laying all four columns side by side.
>>>
>>> I have compared the pain scores of two groups of patients post caesarean
>>> section, before and after taking their pain medications. The sm group take
>>> their own pain killers, and the nsm group are given the painkillers by the
>>> midwves.
>>>
>>> This is the code that I used:
>>>
>>> twoway (bar meanpain group) (rcap  upper_pain lower_pain group) (bar
>>> meanmed group) (rcap  upper_med lower_med group), by(group)
>>>
>>> i'm not sure where i'm going wrong with this.
>>>
>
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