Tagged with #readposranksum
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Comments (4)

I read the documentation for MappingQualityRankSumTest and ReadPosRankSumTest: http://www.broadinstitute.org/gatk/gatkdocs/org_broadinstitute_sting_gatk_walkers_annotator_MappingQualityRankSumTest.html http://www.broadinstitute.org/gatk/gatkdocs/org_broadinstitute_sting_gatk_walkers_annotator_ReadPosRankSumTest.html

Both pages read: "The ... rank sum test can not be calculated for sites without a mixture of reads showing both the reference and alternate alleles."

I have quite a few sites for which MQRankSum and ReadPosRankSum are missing. How does VariantRecalibrator handle this missing information?

Comments (1)

Hey guys,

im struggeling with some statistics given by the vcf file: the Ranksumtests. I started googleing arround, but that turned out to be not helpfult for understanding it (in may case). I really have no idea how to interprete the vcf-statistic-values comming from ranksumtest. I have no clue whether a negative, positive or value near zero is good/bad. Therefore im asking for some help here. Maybe someone knows a good tutorial-page or can give me a hint to better understand the values of MQRankSum, ReadPosRankSum and BaseQRankSum. I have the same problem with the FisherStrand statistics. Many, many thanks in advance.

Comments (2)

I have run UnifiedGenotyper with the -glm options SNP and BOTH. These two approaches yield identical variants and identical genotype likelihoods (at least the first 100k variants I checked). However, a few of the annotations have different values: BaseQRankSum MQRankSum ReadPosRankSum

-glm SNP on the left and -glm BOTH on the right:

MQRankSum=-1.762 MQRankSum=-1.785

MQRankSum=-5.307 MQRankSum=-4.970

MQRankSum=0.262 MQRankSum=-0.022

MQRankSum=-0.680 MQRankSum=-0.710

MQRankSum=1.016 MQRankSum=0.231

MQRankSum=-0.693 MQRankSum=-0.681

MQRankSum=-0.839 MQRankSum=-0.830

MQRankSum=1.924 MQRankSum=1.889

MQRankSum=-0.991 MQRankSum=-0.665

MQRankSum=-0.459 MQRankSum=-0.958

BaseQRankSum=-1.803 BaseQRankSum=-1.881

BaseQRankSum=6.918 BaseQRankSum=6.894

BaseQRankSum=-2.512 BaseQRankSum=-2.524

BaseQRankSum=2.000 BaseQRankSum=2.020

BaseQRankSum=2.095 BaseQRankSum=2.006

BaseQRankSum=2.134 BaseQRankSum=2.223

BaseQRankSum=-3.622 BaseQRankSum=-3.547

BaseQRankSum=1.569 BaseQRankSum=1.586

BaseQRankSum=-3.416 BaseQRankSum=-3.733

BaseQRankSum=-1.745 BaseQRankSum=-1.769

ReadPosRankSum=-0.341 ReadPosRankSum=-0.280

ReadPosRankSum=4.207 ReadPosRankSum=4.190

ReadPosRankSum=-3.809 ReadPosRankSum=-3.832

ReadPosRankSum=-2.047 ReadPosRankSum=-2.060

ReadPosRankSum=-1.279 ReadPosRankSum=-1.232

ReadPosRankSum=-3.921 ReadPosRankSum=-3.955

ReadPosRankSum=-1.500 ReadPosRankSum=-1.486

ReadPosRankSum=-0.374 ReadPosRankSum=-0.403

ReadPosRankSum=3.209 ReadPosRankSum=3.188

ReadPosRankSum=1.889 ReadPosRankSum=1.868

Why is that?

I noticed another user got different variants, but I get the same variants and the same likelihoods: [http://gatkforums.broadinstitute.org/discussion/1782/unifiedgenotyper-different-glm-value-result-in-different-sets-of-variants]

I ran single threaded.

I use MQRankSum and ReadPosRankSum for VariantRecalibrator, so it affects my downstream results, if the annotations are -glm dependent. Hence I am asking my question. I hope you can illuminate me. Thank you.