# Obtain MAF column for a summary statistic

**URL:** <https://discuss.hail.is/t/obtain-maf-column-for-a-summary-statistic/2745>\
**Category:** Hail Query & hailctl\
**Created:** [July 4, 2022, 5:09pm UTC](https://discuss.hail.is/t/obtain-maf-column-for-a-summary-statistic/2745 "2022-07-04T17:09:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mahantesh19](https://yyz2.discourse-cdn.com/flex036/user_avatar/discuss.hail.is/mahantesh19/32/621_2.png) [@mahantesh19](https://discuss.hail.is/u/mahantesh19)\
**Post date:** [July 4, 2022, 5:09pm UTC](https://discuss.hail.is/t/obtain-maf-column-for-a-summary-statistic/2745/1 "2022-07-04T17:09:49Z")

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I have a summary statistic for which I don’t have a MAF column. I would like to know what is the best way to obtain this information using rs id or CHR:POS:REF: ALT data?

PS: I’m new to Hail!

Thanks in advance

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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:** [July 5, 2022, 2:20pm UTC](https://discuss.hail.is/t/obtain-maf-column-for-a-summary-statistic/2745/2 "2022-07-05T14:20:45Z")

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the minor allele frequency is not a global property of a specific locus, but rather a property of a locus _in a specific sample cohort_. If you’re trying to look up the MAF of the dataset used to compute the summary statistic, you’re going to need access to the raw data used.