Re: st: error bars in marginsplot

[Maarten Buis <maartenlbuis@gmail.com>]

On Sat, Sep 15, 2012 at 6:34 PM, Jordan Silberman wrote:
> Is it possible to have the marginsplot command display error bars that
> are 1 standard error wide, rather than displaying error bars that are
> the full 95% CI?

We can use the -level()- option for that. The trick is to find the
level that corresponds with 1 standard error. This is
normal(1)-normal(-1). Since the -level()- option works in percentages,
we need to multiply that by 100, and since it only takes two decimal
places after the decimal point, we need to use the -round()- option.
Putting all this together:

*------------------ begin example ------------------
sysuse auto, clear
reg price i.rep78
margins, over(rep78)
marginsplot , ///
    level(`=round((normal(1)-normal(-1))*100,.01)')
*------------------- end example -------------------
(For more on examples I sent to the Statalist see:
http://www.maartenbuis.nl/example_faq )

Hope this helps,
Maarten

---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/