# Negative prior distribution

**URL:** <https://discourse.mc-stan.org/t/negative-prior-distribution/18093>\
**Category:** brms\
**Tags:** fitting-issues, specification\
**Created:** [September 20, 2020, 5:01pm UTC](https://discourse.mc-stan.org/t/negative-prior-distribution/18093 "2020-09-20T17:01:31Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![JimBob](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/jimbob/32/19329_2.png) [@JimBob](https://discourse.mc-stan.org/u/JimBob)\
**Post date:** [September 22, 2020, 12:16pm UTC](https://discourse.mc-stan.org/t/negative-prior-distribution/18093/2 "2020-09-22T12:16:59Z")

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Not the ideal fix, but if you literally just wanted to get something so that you can move on with exercises, you could specify the dreaded uniform prior, between some negative value and 0. Then it would be bounded at zero. This is almost certainly not what Richard would like you to do, but perhaps it could be a quick fix to move forward, and you can come back when someone more experienced has a better solution!?

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