|
Relative efficiency of ANCOVA and Mann-Whitney combining all sample sizes. Values less than 1 indicate greater power of ANCOVA; greater than 1 indicates superiority of Mann-Whitney. |
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| Distribution |
Correlation between baseline and post-treatment score |
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|
|
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| 0.1 |
0.2 |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
|
|
|
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| Moderate positive skew: shift |
0.9342 |
0.9257 |
0.8707 |
0.8532 |
0.8569 |
0.9030 |
0.9447 |
0.9538 |
0.9963 |
| Moderate positive skew: ratio |
1.1560 |
1.1300 |
1.1074 |
1.0800 |
0.8170 |
0.8656 |
0.9065 |
0.9231 |
0.9720 |
| Moderate negative skew: shift |
0.9392 |
0.9058 |
0.8837 |
0.8444 |
0.8799 |
0.9114 |
0.9421 |
0.9593 |
0.9885 |
| Moderate negative skew: ratio |
1.1766 |
1.1946 |
1.1467 |
1.0980 |
0.8851 |
0.9319 |
0.9671 |
1.0241 |
1.0390 |
| Uniform: shift |
0.9492 |
0.9170 |
0.8869 |
0.8480 |
0.8586 |
0.8977 |
0.9281 |
0.9723 |
1.0021 |
| Uniform: ratio |
0.9575 |
0.9384 |
0.8862 |
0.8499 |
0.8604 |
0.8849 |
0.9213 |
0.9467 |
0.9895 |
| Extreme negative skew: shift |
1.4019 |
1.3718 |
1.3339 |
1.3045 |
0.8987 |
0.9425 |
0.9475 |
0.9405 |
0.9345 |
| Extreme negative skew: ratio |
1.6914 |
1.6185 |
1.6101 |
1.5835 |
1.0153 |
1.0367 |
1.0247 |
1.0344 |
1.0062 |
| Normal: shift |
0.9700 |
0.9393 |
0.9142 |
0.8445 |
0.8372 |
0.8840 |
0.9065 |
0.9485 |
0.9734 |
| Normal: ratio |
0.9551 |
0.9506 |
0.9126 |
0.8791 |
0.8536 |
0.8859 |
0.9072 |
0.9293 |
0.9654 |
Vickers BMC Medical Research Methodology 2005 5:35 doi:10.1186/1471-2288-5-35 |
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