Sample Size : Power : Confidence Intervals : Pilot Studies :

Data Input for Sample Size Estimation is a table of 3 columns

• Each row contains data from a separate study
• Col 1 = probability of Type I error (alpha)
• Col 2 = power (1-beta)
• Col 3 = expected correlation coefficient ρ

Data Input for Power Estimation is a table of 3 columns

• Each row contains data from a separate study
• Col 1 = probability of Type I error (α)
• Col 2 = sample size in the study
• Col 3 = correlation coefficient (ρ) observed

Data Input for Confidence Interval Study is is a table of 3 columns

• Each row contains data from a separate study
• Col 1 = percent confidence (usually 95)
• Col 2 = sample size
• Col 3 = correlation coefficient (ρ)

Data Input for Pilot Study is for a single plan, a single column with 4 rows

• Row 1 : Percent Confidence required, usually 95 or 99
• Row 2 : Planned Correlation coefficient (ρ)
• Row 3 : Sample Size Interval, usually 5
• Row 4 : Maximum Sample size, usually 50

Machin D, Campbell M, Fayers, P, Pinol A (1997) Sample Size Tables for Clinical Studies. Second Ed. Blackwell Science IBSN 0-86542-870-0 p. 168-172

Altman DG, Machin D, Bryant TN and Gardner MJ. (2000) Statistics with Confidence Second Edition. BMJ Books ISBN 0 7279 1375 1. p. 89-92