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Re: st: RE: Bargraphs, order, SD
I was told by my supervisor to use SE, but I�ve seen similar plots with CI.
As I do not manage to make it right in STATA, I think I�ll have to create
the bar graphs in Excel. I thought this would me much easier than it turn
out to be. I only want to make one graph with all nine types containing the
variable with SE /CI.
Anne-Christine
On 6/11/07 1:35 PM, "Ronan Conroy" <[email protected]> wrote:
> On 11 Meith 2007, at 12:00, Nick Cox wrote:
>
>> Biologists in particular seems overly fond of just
>> showing means (+/- sd, se, or constant * se) in what
>> Stata user Paul Seed has called detonator plots.
>>
>> A dotplot with means and sds added (see -dotplot-)
>> shows far more information.
>
> It's a lazy habit, and one which has been opposed by the guidelines
> of the International Committee of Medical Journal Editors since their
> initial publication in 1979. The guidelines state:
>
> Describe statistical methods with enough detail to enable a
> knowledgeable reader with access to the original data to verify the
> reported results. When possible, quantify findings and present them
> with appropriate indicators of measurement error or uncertainty (such
> as confidence intervals).
>
> Note that the appropriate indicator of measurement error is the
> confidence interval. There is also disconcerting research which shows
> the extent to which error bars are misunderstood by readers.
>
> http://psyphz.psych.wisc.edu/~shackman/belia_PsychMeth2005.pdf
>
> Does anyone know of a serious reason for putting error bars in
> graphs? The one I always get is "but the journal will expect it" or
> "but everyone does it", neither of which is a defense.
>
> =============
> Ronan Conroy
> [email protected]
> Royal College of Surgeons in Ireland
> +353 (0)1 402 2431
> +353 (0)87 799 97 95
> http://www.flickr.com/photos/ronanconroy/
>
>
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