Do you mean this:
\def\ci{\perp\!\!\!\perp}
$A\ci B \,|\, C $
I found it at:
http://www.mail-archive.com/[email protected]/msg01250.html
Scott
On Mon, Jul 28, 2008 at 6:27 AM, Newson, Roger B
<[email protected]> wrote:
>
> Fellow Statalisters (especially Stata Journal (SJ) editors):
>
> A TeXnical query re SJ LaTeX. What LaTeX symbol does SJ use to represent
> the (increasingly popular) conditional independence symbol introduced by
> Dawid (1979)? I ask because I cannot find it listed in Section 3.3 of
> the LaTeX guide (Lamport, 1994), and an early SJ article (Becker and
> Ichino, 2004) uses as a substitute the official LaTeX \bot symbol (which
> is similar but not the same), but a more recent SJ article (Nannicini,
> 2007) uses something that appears more like the original Dawid symbol.
> Do SJ authors need to know anything special and/or install extra fonts
> in order to use this symbol?
>
> Best wishes (and thanks in advance)
>
> Roger
>
>
> References
>
> Becker SO, Ichino A. 2002. Estimation of average treatment effects based
> on propensity scores. The Stata Journal 2(4): 358-377.
>
> Dawid AP. 1979. Conditional independence in statistical theory. Journal
> of the Royal Statistical Society Series B (Methodological),41(1): 1-31.
>
> Lamport L. 1994. LaTeX: a document preparation system. 2nd Edition.
> Addison-Wesley. Boston, Mass: Addison-Wesley.
>
> Nannicini TS. 2007. Simulation-based sensitivity analysis for matching
> estimators. The Stata Journal 7(3): 334-350.
>
> Roger B Newson
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