Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: Problem with -ci- in particular dataset


From   Gary Longton <glongton@fhcrc.org>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Problem with -ci- in particular dataset
Date   Wed, 04 May 2005 13:43:23 -0700

Philip Greenwood wrote:

I'm having a little trouble with the -ci- command with several binary variables in a particular dataset. The problem  is reproducible on other machines with this dataset, but not with other datasets. The problem is that -ci- displays 0 for all statistics, yet the correct results are returned to macros. I'll paste some output;

*--snip

. ci var1

    Variable |        Obs        Mean    Std. Err.       [95% Conf. Interval]
-------------+---------------------------------------------------------------
        var1 |       1102           0           0               0           0

. return list

scalars:
                r(ub) =  .2770129342413987
                r(lb) =  .2257093888076031
                r(se) =  .0130734919800961
              r(mean) =  .2513611615245009
                 r(N) =  1102

Other commands such as -summarize- are not producing the same problem. All I can think of is that the displayed values are getting rounded to integer values somehow. -ci- normally works fine. Does anyone have any suggestion as what is wrong with my dataset?
It appears that -ci- uses the display format of the binary variable for its output format (I'm still in version 8.2, so can't yet speak for version 9). My guess is that your var1 has a fixed display format such as %3.0f. A change to a %g format (eg. -format var1 %4.0g-) or an %f format with a non-zero value for the # decimal places should result in output with more precision.

- Gary

*
* 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/




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