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Phred quality score

Definition
AI-generated

A Phred quality score Q means an error probability of 10^(−Q/10).

Topics
Sequencing Data Analysis
Synonyms
Phred scale
Related
Base quality Genotype quality (GQ) Mapping quality (MAPQ)

Why it matters in GWAS

Phred scaling unifies QC thresholds across tools; miscalibrated scores undermine filters and association tests.

Example usage

"A Phred quality score of Q30 implies roughly one base error per thousand calls under ideal calibration."

Base quality Genotype quality (GQ) Mapping quality (MAPQ) Phred-scaled genotype likelihoods (PL) PL and GQ
Related-term network

Click any node to open that term page.

Node order. The current term is first. Next come every page linked from Related terms, in the same top-to-bottom order as that list. Then new terms appear in two-hop layers: for each of those direct neighbors (in that same order), their related terms are appended if not already listed. A third pass does the same for two-hop nodes. The walk stops when a fixed maximum number of nodes is reached.

References

  • Ewing B, Green P. (1998). Base-calling of automated sequencer traces using phred. II. Error probabilities. Genome Res.
← Phosphorylation Phred-scaled genotype likelihoods (PL) →

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