# GLM with growth function - problem of indetermiinability when slope = 0

**URL:** <https://discourse.mc-stan.org/t/glm-with-growth-function-problem-of-indetermiinability-when-slope-0/4255>\
**Category:** Modeling\
**Tags:** techniques\
**Created:** [May 19, 2018, 4:15am UTC](https://discourse.mc-stan.org/t/glm-with-growth-function-problem-of-indetermiinability-when-slope-0/4255 "2018-05-19T04:15:04Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![stemangiola](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/stemangiola/32/260_2.png) [@stemangiola](https://discourse.mc-stan.org/u/stemangiola)\
**Post date:** [May 19, 2018, 8:31am UTC](https://discourse.mc-stan.org/t/glm-with-growth-function-problem-of-indetermiinability-when-slope-0/4255/3 "2018-05-19T08:31:48Z")

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Thanks a lot,

> [@stijn](#):
>
> intuitively it makes sense for me to have a prior that says if w is not very large, it is unlikely that b is very large

I will try.

(@martinmodrak any news about your experience ? )

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