On the Use of a Pilot Sample for Sample Size Determination¶
Browne, R. H. (1995). On the Use of a Pilot Sample for Sample Size Determination. Statistics in Medicine, 14(17), 1933-1940.
Cited by¶
1 citation across 1 artifact.
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Mechanisms¶
- Pilot Variance Estimation
- … a small pilot's variance estimate is itself noisy and tends to read low, so taking the point estimate at face value quietly underpowers the confirmatory study — the reason methodologists recommend carrying a conservative upper bound on the pilot variance rather than its raw estimate into the sample-size calculation.
This sourceShows that a small pilot standard-deviation estimate is imprecise and often yields a confirmatory study with less than planned power, and recommends using an upper one-sided confidence limit in the sample-size calculation.
- … a small pilot's variance estimate is itself noisy and tends to read low, so taking the point estimate at face value quietly underpowers the confirmatory study — the reason methodologists recommend carrying a conservative upper bound on the pilot variance rather than its raw estimate into the sample-size calculation.
Verification¶
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Registry ID ref:63b9a968abf6 · see in the full table