VCF Variant Filtering Guide
Overview
Raw VCF files produced by variant callers (GATK HaplotypeCaller, bcftools mpileup, DeepVariant, etc.) contain a mixture of true variants and artifacts from sequencing errors, alignment issues, and low-coverage regions. Computing summary statistics -- Ts/Tv ratio, variant counts, allele frequency distributions -- on unfiltered data yields unreliable results because false-positive calls disproportionately inflate transversion counts and depress the Ts/Tv
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