# Test: Soft vs Hard sum-to-zero constrain + choosing the right prior for soft constrain

**URL:** <https://discourse.mc-stan.org/t/test-soft-vs-hard-sum-to-zero-constrain-choosing-the-right-prior-for-soft-constrain/3884>\
**Category:** Modeling\
**Created:** [April 16, 2018, 7:04pm UTC](https://discourse.mc-stan.org/t/test-soft-vs-hard-sum-to-zero-constrain-choosing-the-right-prior-for-soft-constrain/3884 "2018-04-16T19:04:52Z")\
**Posts on this page:** 1\
**Showing post:** 40

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**Author:** ![Bob\_Carpenter](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/bob_carpenter/32/9230_2.png) [@Bob\_Carpenter](https://discourse.mc-stan.org/u/Bob_Carpenter)\
**Post date:** [October 22, 2018, 10:54pm UTC](https://discourse.mc-stan.org/t/test-soft-vs-hard-sum-to-zero-constrain-choosing-the-right-prior-for-soft-constrain/3884/40 "2018-10-22T22:54:12Z")

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Oh, I forgot to add that Yuling has been working on this. See [this Discourse topic on soft contraints](https://discourse.mc-stan.org/t/does-the-soft-constraint-converge-to-rigid-constraint/6127). I still haven’t digested it all yet, so I’m afraid I can’t summarize.

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_[View the full topic](https://discourse.mc-stan.org/t/test-soft-vs-hard-sum-to-zero-constrain-choosing-the-right-prior-for-soft-constrain/3884)._