Fig. 1From: Text mining-based measurement of precision of polysomnographic reports as basis for interventionCorrespondence analysis (CA) of the term-document matrix. The left panel (a) displays the term scores on the first 2 CA axes. The right panel (b) shows a ‘spider’ diagram connecting each level of the explanatory variables (apnea severity, physicians, type of apnea and technicians) to its group centroid on both main axes of the canonical correspondence analysisBack to article page