Intro to Predictive Coding: Overview & Interpretation of Terminology June 2014 | Page 24

Glossary
Contingency Table – a table of the four response
states in a categorization task. The rows of
the table may correspond to the correct or true
category values and the columns may correspond to
the choices made by system. For example, the top
row may be the truly positive category (e.g. truly
responsive documents) and the second row may be
the truly negative category (e.g., truly nonresponsive documents).
The columns then represent the positive decisions
made by the system (e.g., putatively responsive)
and the negative decisions made by the system
(e.g., putatively non-responsive). The entries in
these cells are the counts of documents
corresponding to each response state (e.g., true
positives, false negatives, false positives, true
negatives). Contingency tables are often displayed
along with the totals for each row and for each
column. Sometimes the rows and columns are
reversed, so the columns reflect the true values and
the rows reflect the choices.