# Joint PDF Surrogate Model

**URL:** <https://discourse.pymc.io/t/joint-pdf-surrogate-model/1560>\
**Category:** Questions\
**Created:** [July 23, 2018, 5:43pm UTC](https://discourse.pymc.io/t/joint-pdf-surrogate-model/1560 "2018-07-23T17:43:33Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![NateAM](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/nateam/32/1875_2.png) [@NateAM](https://discourse.pymc.io/u/NateAM)\
**Post date:** [July 26, 2018, 8:23pm UTC](https://discourse.pymc.io/t/joint-pdf-surrogate-model/1560/7 "2018-07-26T20:23:01Z")

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Basically this: [Feeding Posterior back in as Prior (updating a model)](https://discourse.pymc.io/t/feeding-posterior-back-in-as-prior-updating-a-model/288) except including the interactions between variables which I think the approach as implemented in the simple example in the included link doesn’t do?

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