# What is Hail's methodology?

**URL:** <https://discuss.hail.is/t/what-is-hails-methodology/1242>\
**Category:** Hail Query & hailctl\
**Created:** [January 14, 2020, 2:12am UTC](https://discuss.hail.is/t/what-is-hails-methodology/1242 "2020-01-14T02:12:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![cliveno1](https://yyz2.discourse-cdn.com/flex036/user_avatar/discuss.hail.is/cliveno1/32/1115_2.png) [@cliveno1](https://discuss.hail.is/u/cliveno1)\
**Post date:** [January 14, 2020, 2:12am UTC](https://discuss.hail.is/t/what-is-hails-methodology/1242/1 "2020-01-14T02:12:51Z")

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Hi - I’m just wondering. I can’t see in the documentation any reference to the methods being employed (i.e. in GWAS e.g. LMM etc) or any citation material if I attempted to publish any findings.

Can someone direct me to it please (apologies if I’ve missed something obvious).

Thanks

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**Author:** ![tpoterba](https://yyz2.discourse-cdn.com/flex036/user_avatar/discuss.hail.is/tpoterba/32/61_2.png) [@tpoterba](https://discuss.hail.is/u/tpoterba)\
**Post date:** [January 14, 2020, 10:39am UTC](https://discuss.hail.is/t/what-is-hails-methodology/1242/2 "2020-01-14T10:39:21Z")

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Hail doesn’t have a prepackaged ‘gwas’ method, so the documentation is on each specific method that might be used to do per-variant association tests, which you can find [on the statistical methods page](https://hail.is/docs/0.2/methods/stats.html#hail.methods.linear_regression_rows):

- linear\_regression\_rows
- logistic\_regression\_rows
- poisson\_regression\_rows
- linear\_mixed\_regression\_rows

Note that these methods are not called “gwas” because they are useful outside of variant association – these same methods work after aggregating rare variants per gene in a burden test, for instance!

You can absolutely cite the software, there’s a `hl.citation` method that generates versioned links for reproducibility:

```auto
>>> print(hl.citation())
Hail Team. Hail 0.2.13-81ab564db2b4. https://github.com/hail-is/hail/releases/tag/0.2.13.

```

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<div class="post-metadata">

**Author:** ![cliveno1](https://yyz2.discourse-cdn.com/flex036/user_avatar/discuss.hail.is/cliveno1/32/1115_2.png) [@cliveno1](https://discuss.hail.is/u/cliveno1)\
**Post date:** [January 15, 2020, 4:37am UTC](https://discuss.hail.is/t/what-is-hails-methodology/1242/3 "2020-01-15T04:37:57Z")

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Thanks