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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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The impact of distribution on Ferguson's δ. Illustration of the association between the score distribution and Ferguson's δ using simulated data. Figure A represents a normal distribution (n = 30); Figure B represents a skewed distribution (n = 30); Figure C represents a highly skewed distribution with a marked 'floor effect' (n = 30).
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Figure 6: The impact of distribution on Ferguson's δ. Illustration of the association between the score distribution and Ferguson's δ using simulated data. Figure A represents a normal distribution (n = 30); Figure B represents a skewed distribution (n = 30); Figure C represents a highly skewed distribution with a marked 'floor effect' (n = 30).

Mentions: Consider 30 subjects displaying a normal distribution on a 10-point scale (Figure 6a). is 106. The standard computation of Ferguson's δ yields: .


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

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

The impact of distribution on Ferguson's δ. Illustration of the association between the score distribution and Ferguson's δ using simulated data. Figure A represents a normal distribution (n = 30); Figure B represents a skewed distribution (n = 30); Figure C represents a highly skewed distribution with a marked 'floor effect' (n = 30).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 6: The impact of distribution on Ferguson's δ. Illustration of the association between the score distribution and Ferguson's δ using simulated data. Figure A represents a normal distribution (n = 30); Figure B represents a skewed distribution (n = 30); Figure C represents a highly skewed distribution with a marked 'floor effect' (n = 30).
Mentions: Consider 30 subjects displaying a normal distribution on a 10-point scale (Figure 6a). is 106. The standard computation of Ferguson's δ yields: .

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