Is there a word that means the 'inverse of variance'? That is, if $X$ has high variance, then $X$ has low $dots$? Not interested in a near antonym (like 'agreement' or 'similarity') but specifically meaning $1/sigma^2$?

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#### Best Answer

$1/sigma^2$ is called **precision**. You can find it often mentioned in Bayesian software manuals for BUGS and JAGS, where it is used as a parameter for normal distribution instead of variance. It became popular because gamma can be used as a conjugate prior for precision in normal distribution as noticed by Kruschke (2014) and *@Scortchi*.

Kruschke, J. (2014). *Doing Bayesian Data Analysis: A Tutorial with R, JAGS, and Stan.* Academic Press, p. 454.

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