# Why use precision instead of variance in a prior?

I am a newcomer in the field of statistic. I am wondering about using precision instead of variance in a prior.

• Can you make your question more precise? As given, it is too vague. – Xi'an Jul 14 '15 at 7:24
• I provided an answer that assumed that you ask about Normal distribution but please correct me if I am wrong. If the question is about parametrization of Normal distribution please edit your question so ti is more precise. – Tim Jul 14 '15 at 7:38

• In WinBUGS or BUGS $precision=\frac{1}{Variance}$ – Deep North Jul 14 '15 at 11:15