# Hierarchical Gompertz model

**URL:** https://discourse.mc-stan.org/t/hierarchical-gompertz-model/13724
**Category:** brms
**Tags:** covid-19
**Created:** [March 17, 2020, 11:05pm UTC](https://discourse.mc-stan.org/t/hierarchical-gompertz-model/13724 "2020-03-17T23:05:31Z")
**Posts on this page:** 1
**Showing post:** 81

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### Author: ![jroon](https://avatars.discourse-cdn.com/v4/letter/j/fbc32d/32.png) [@jroon](https://discourse.mc-stan.org/u/jroon)
#### Post date: [April 14, 2020, 9:04am UTC](https://discourse.mc-stan.org/t/hierarchical-gompertz-model/13724/81 "2020-04-14T09:04:54Z")

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Hi @mevers - I dont’ mind that, but i’m basically done with it now because non-model problems came up.  
@martinmodrak Yes I discovered that ymax needed to be a parameter and I did that using a missing value approach with success! Thanks to you both for your help! Good luck @mevers with your project!

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