st: RE: plot of median bias with CI

 From "Nick Winter" To Subject st: RE: plot of median bias with CI Date Wed, 21 Aug 2002 08:15:52 -0400

```> -----Original Message-----
> From: Lars Korsholm [mailto:korsholm@isd.sdu.dk]
> Sent: Wednesday, August 21, 2002 5:40 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: plot of median bias with CI
>
>
> Hi
>
> I have a simulation study where for each value of mu I have 1000
> estimates. Mu runs from .01 to .31
> The "true" value depends on mu.
> its farly easy to plot the median or any other egen-statstics
> versus mu.
> BUT I would like to plot the median _with_ the associated confidense
> interval from -centile- (anything better?)
>
> With a -foreach x=1/31 {- loop this i possible
> since the values of mu is "nice"
> But can it be done smarter/easier/more general?
>
>
> gen bias=est-true
> gen double cen=.
> gen double up=.
> gen double do=.
> forvalues x = 1/31 {
>   qui centile bias if mu==`x'/100
>   replace cen=`r(c_1)' if mu==`x'/100
>   replace up=`r(ub_1)' if mu==`x'/100
>   replace do=`r(lb_1)' if mu==`x'/100
> }
>
> bysort mu: keep if _n==1
> gr cen up do mu, c(.||) s(x..) sa(gr1, replace)
>
> best lars

If you are looking for a more general way to obtain the values of mu,
consider -vallist-, a utility by Nick Cox which does just this.  Or, you
can do it yourself with the tabulate command:

tab mu , matrow(rows)
forvalues x= 1/`r(r)' {
local curmu = rows[`x',1]
qui centile bias if mu==`curmu'
...
}

-Nick Winter
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
```