# File traitsdivision.mugration\_model

**URL:** <https://nextstrain.discourse.group/t/file-traitsdivision-mugration-model/1210>\
**Category:** General\
**Created:** [August 8, 2022, 3:30pm UTC](https://nextstrain.discourse.group/t/file-traitsdivision-mugration-model/1210 "2022-08-08T15:30:08Z")\
**Posts on this page:** 1\
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**Author:** ![trvrb](https://yyz1.discourse-cdn.com/flex031/user_avatar/nextstrain.discourse.group/trvrb/32/2_2.png) [@trvrb](https://nextstrain.discourse.group/u/trvrb)\
**Post date:** [August 9, 2022, 6:34pm UTC](https://nextstrain.discourse.group/t/file-traitsdivision-mugration-model/1210/2 "2022-08-09T18:34:08Z")

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Hi @juan_dc. These files are output as part of running [“augur traits”](https://docs.nextstrain.org/projects/augur/en/stable/usage/cli/traits.html), which is effectively a wrapper around TreeTime’s [“mugration” model](https://treetime.readthedocs.io/en/latest/commands.html#mugration). In a trait model, the rate of transition from states A→B, A→C, etc… is estimated. The `mugration_model.txt` output is pairwise matrix listing these rates. These pairwise rates should be largely comparable to pairwise rates estimated by BEAST using a standard phylogeographic model.

In addition, you get a JSON file that gives estimated locations of internal nodes in the tree and relative probability of these locations.

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