# Multinomial regression on iris dataset convergence issues

**URL:** <https://discourse.pymc.io/t/multinomial-regression-on-iris-dataset-convergence-issues/3764>\
**Category:** Questions\
**Created:** [August 21, 2019, 3:42pm UTC](https://discourse.pymc.io/t/multinomial-regression-on-iris-dataset-convergence-issues/3764 "2019-08-21T15:42:19Z")\
**Posts on this page:** 1\
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**Author:** ![junpenglao](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/junpenglao/32/8_2.png) [@junpenglao](https://discourse.pymc.io/u/junpenglao)\
**Post date:** [August 21, 2019, 5:09pm UTC](https://discourse.pymc.io/t/multinomial-regression-on-iris-dataset-convergence-issues/3764/2 "2019-08-21T17:09:02Z")

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Your model is over parameterized - it is thus unidentifiable and doesnt converge. You can for example have a look at [Multinomial hierarchical regression with multiple observations per group ("Bad energy issue")](https://discourse.pymc.io/t/multinomial-hierarchical-regression-with-multiple-observations-per-group-bad-energy-issue/2755/18)

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