On the Use of the Upper Confidence Limit for the Variance from a Pilot Sample for Sample Size Determination

1996 ◽  
Vol 38 (8) ◽  
pp. 941-949 ◽  
Author(s):  
Meinhard Kieser ◽  
Gernot Wassmer
Keyword(s):  
Sample Size ◽  
Confidence Limit ◽  
Sample Size Determination ◽  
Size Determination ◽  
Upper Confidence Limit ◽  
Pilot Sample

A Correction for Biasing Effects of Pilot Sample Size on Sample Size Determination

1987 ◽  
Vol 24 (3) ◽  
pp. 319-321 ◽  
Author(s):  
Ronald E. Shiffler ◽  
Arthur J. Adams
Keyword(s):  
Pilot Study ◽  
Sample Size ◽  
Random Variable ◽  
Sample Size Determination ◽  
Size Determination ◽  
Correction Factors ◽  
Biasing Effects ◽  
Pilot Sample

When a pilot study variance is used to estimate σ2 in the sample size formula, the resulting [Formula: see text] is a random variable. The authors investigate the theoretical behavior of [Formula: see text]. Though [Formula: see text] is more likely to underachieve than overachieve the unbiased n, correction factors to balance the bias are provided.

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