Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: adjusted fitted-line/scatter plot after bootstrap with CI


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: adjusted fitted-line/scatter plot after bootstrap with CI
Date   Wed, 30 Nov 2011 08:42:15 +0000

-qfitci- is _not_ for displays after model estimation. I think you are
going to have to do this yourself.
Confidence intervals can be shown using -rarea-.

Nick

On Wed, Nov 30, 2011 at 5:34 AM, Juan Dominguez
<juan.dominguez@monash.edu> wrote:

> I am fitting a model with a quadratic term (reg DV IV IV^2 COVs) and I
> would like to graph the quadratic relationship after adjustment for
> covariates and bootstrapping with confidence interval envelope much as
> fracplot does after fracpoly.
>
> I tried cprplot but it won't work with bootstrap and won't add CI. In
> addition, cprplot will draw a straight line rather than a curve
> describing the quadratic relationship. The lowess option does not
> yield a satisfactory curve like fracplot. acprplot will run after
> bootstrapping (as in reg DV IV IV^2 COV, vce(boot, boot_options)), but
> just like cprplot, it won't graph the quadratic curve and won't
> include the CI envelope.
>
> Is there a way to accomplish this using qfitci?
>
> Best next thing is predxcon and while it does display a line fitted to
> predicted values it can't be used in combination with bootstrap and it
> won't include the associated scatter plot.
>
> In a previous posting on this list for a similar query it was
> suggested to manually predict y and se after the adjusted regression,
> and draw the regression line with ci's on top of the scatterplot. I
> know how to predict y and se but I don't know how to draw the
> subsequent (curved) regression line with ci's.
*
*   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/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index