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Table 8 Ratio of ANCOVA estimate of treatment effect to true treatment effect.

From: Parametric versus non-parametric statistics in the analysis of randomized trials with non-normally distributed data

Moderate positive skew: shift

0.9955

Moderate positive skew: ratio

0.9890

Moderate negative skew: shift

1.0003

Moderate negative skew: ratio

0.9823

Uniform: shift

1.0028

Uniform: ratio

1.0005

Extreme asymmetry: shift

1.0067

Extreme asymmetry: ratio

0.9122

Extreme negative skew: shift

0.9973

Extreme negative skew: ratio

1.0055

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BMC Medical Research Methodology

ISSN: 1471-2288

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