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

Terluin B, Knol DL, Terwee CB, de Vet HC - Health Qual Life Outcomes (2009)

Bottom Line: A critique of Hankins, M: 'How discriminating are discriminative instruments?' Health and Quality of Life Outcomes 2008, 6:36.

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ABSTRACT
A critique of Hankins, M: 'How discriminating are discriminative instruments?' Health and Quality of Life Outcomes 2008, 6:36.

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Adjusting Ferguson's δ for non-reliable differences. Elaboration of Figure 3 to illustrate how Ferguson's δ can be adjusted for non-reliable differences. The lightly shaded cells comprise comparisons of subjects whose differences fall below the smallest detectable difference, which is 3.24 in this case.
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Figure 5: Adjusting Ferguson's δ for non-reliable differences. Elaboration of Figure 3 to illustrate how Ferguson's δ can be adjusted for non-reliable differences. The lightly shaded cells comprise comparisons of subjects whose differences fall below the smallest detectable difference, which is 3.24 in this case.

Mentions: in which by definition fj = 0 when j < 1 or j > q. Figure 5 illustrates the calculation. Cells in which between-subject differences are 3 or smaller are lightly shaded. Ferguson's δ, adjusted for non-reliable differences, can be calculated for our Example 3 as:


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

Terluin B, Knol DL, Terwee CB, de Vet HC - Health Qual Life Outcomes (2009)

Adjusting Ferguson's δ for non-reliable differences. Elaboration of Figure 3 to illustrate how Ferguson's δ can be adjusted for non-reliable differences. The lightly shaded cells comprise comparisons of subjects whose differences fall below the smallest detectable difference, which is 3.24 in this case.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2691398&req=5

Figure 5: Adjusting Ferguson's δ for non-reliable differences. Elaboration of Figure 3 to illustrate how Ferguson's δ can be adjusted for non-reliable differences. The lightly shaded cells comprise comparisons of subjects whose differences fall below the smallest detectable difference, which is 3.24 in this case.
Mentions: in which by definition fj = 0 when j < 1 or j > q. Figure 5 illustrates the calculation. Cells in which between-subject differences are 3 or smaller are lightly shaded. Ferguson's δ, adjusted for non-reliable differences, can be calculated for our Example 3 as:

Bottom Line: A critique of Hankins, M: 'How discriminating are discriminative instruments?' Health and Quality of Life Outcomes 2008, 6:36.

View Article: PubMed Central - HTML - PubMed

ABSTRACT
A critique of Hankins, M: 'How discriminating are discriminative instruments?' Health and Quality of Life Outcomes 2008, 6:36.

Show MeSH