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Figure 1 | Health and Quality of Life Outcomes

Figure 1

From: Understanding Ferguson's δ: time to say good-bye?

Figure 1

Graphical representation of how Ferguson's δ 'works'. Ferguson's δ counts comparisons between subjects. In this sample 10 subjects are mutually compared. The subjects have scores 1, 2, ... 9, 10 on an instrument with 10 score categories (i). The frequency (f i ) is 1 for all i scores. The subjects are placed in a 10 × 10 matrix in which each cell comprises 1 comparison of 1 subject with another subject (white cells) or with itself (shaded cells). Ferguson's δ relates the number of discriminating comparisons between subjects (white cells) to all comparisons (all cells). See the text for the actual calculation of δ.

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