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Table 1 Expected values for the six distributions in the simulation study.

From: Parametric methods outperformed non-parametric methods in comparisons of discrete numerical variables

 

Outcome scale

Distribution

{0, 1, 2}

{0, 1, 2, 3}

{0, 1, 2, 3, 4}

{0, 1, 2, 3, 4, 5}

Uniform

1.0

1.5

2.0

2.5

Normal

1.0

1.5

2.0

2.5

U-shaped

1.0

1.5

2.0

2.5

Linear trend

0.63

1.0

1.25

1.625

Step

0.8 & 0.6*

0.9

1.1

1.6

Skewed

*

0.6

0.75

0.88

  1. *An additional step distribution was used instead of the skewed distribution.
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BMC Medical Research Methodology

ISSN: 1471-2288

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