Sample Size : Error : Pilot Studies :

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

• Each row contains data from a separate study
• Col 1 = Confidence interval in percent of observations
• Col 2 = Tolerable error in distance from mean value
• Col 3 = Expected Standard Deviation of the population being sampled

Data Input for Error Estimation is a table of 3 columns

• Each row contains data from a separate study
• Col 1 = Confidence Interval in percent of observations
• Col 2 = Sample size
• Col 3 = Standard Deviation found in sample

Data Input for Pilot Study is for a single plan, a single column with 3 rows

• Row 1 : Percent Confidence required, usually 95 or 99
• Row 2 : Sample Size Interval
• Row 3 : Maximum sample size

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. 131-135