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Table 2 A glossary of key terms, their abbreviations and formulae.

From: Improved results in proteomics by use of local and peptide-class specific false discovery rates

Measurement Formula Description
Corroborating (c) hits   Correct assignments matching together with others to a protein
Non-corroborating (nc) hits   Correct assignments matching singly to a protein
FDR (global FDR)
estimated by
Fraction of incorrect assignments above the score threshold
Local FDR FDR for peptides with score (S):
Fraction of incorrect assignments within a score window
CNC Local FDR   Fraction of incorrect assignments within a score window, separately for assignments matching together with others (c) or singly (nc) to a protein