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The best formula for estimation by distribution. |
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| Best Formula for Sample size (n) |
Mean Estimation |
Standard Deviation Estimation |
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| Formula (5) |
Median |
Formula (16) |
Range/4 |
Range/6 |
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| Log-Normal |
n ≤ 23 |
23 <n |
n ≤ 15 |
15 <n ≤ 64 |
64 <n |
| Beta |
n ≤ 30 |
30 <n |
n ≤ 15 |
15 <n ≤ 100 |
100 <n |
| Exponential |
n ≤ 21 |
21 <n |
n ≤ 15 |
15 <n ≤ 66 |
66 <n |
| Weibull |
n ≤ 25 |
25 <n |
n ≤ 16 |
16 <n ≤ 110 |
110 <n |
Hozo et al. BMC Medical Research Methodology 2005 5:13 doi:10.1186/1471-2288-5-13 |
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