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# Meaning of terms in output of GenotypeConcordance

Posts: 261Member ✭✭
edited October 2013

Just to make sure my understanding is correct:

HET: heterozygous
HOM_REF: homozygous reference
HOM_VAR: homozygous variant
MIXED: something like ./1
Mismatching_Alleles: ??
UNAVAILABLE: for internal use
ALLELES_MATCH: ??
ALLELES_DO_NOT_MATCH: ??
EVAL_ONLY: ??
TRUTH_ONLY: does it actually mean the variants present in comp but not in eval, like COMP_ONLY?


how does the following computed?

Non-Reference_Discrepancy
Non-Reference_Sensitivity
Overall_Genotype_Concordance


Thanks a lot!

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## Answers

• Posts: 261Member ✭✭

Could anyone please help with this? I appreciate!

• Posts: 10,469Administrator, Dev admin

@blueskypy, I've asked the tool's author to answer you but he is very busy so you'll need to be a little patient.

Geraldine Van der Auwera, PhD

• Posts: 11Dev mod

Hi blueskypy,

Thanks for your patience. Your intuition on all counts has been correct.

ALLELES_MATCH are counts of calls at the same site where the alleles match

ALLELES_DO_NOT_MATCH are counts of calls at the same location with different alleles, such as the eval set calling a 'G' alternate allele, and the comp set calling a 'T' alternate allele.

Eval only are the counts of sites present only in the eval VCF, and not in the comp.

Non-reference sensitivity is the sensitivity of the eval calls to polymorphic calls in the comp set, that is (# true positive)/(# true polymorphic).

Overall genotype concordance is just (# concordant genotypes)/(# genotypes)

This tends to be high just because reference calls predominate; so we use in addition the Non-reference discrepancy, which, loosely, is the genotype concordance excluding concordant reference sites. See attached.

• Posts: 10,469Administrator, Dev admin

For future reference, I'm adding this information to the GenotypeConcordance tool documentation, which will be updated with the next release.

Geraldine Van der Auwera, PhD

• Posts: 261Member ✭✭

Thanks, Geraldine! Happy New Year!

• Posts: 10,469Administrator, Dev admin

Happy New Year to you too, and many successful GATK runs

Geraldine Van der Auwera, PhD

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