Estimating the sample size for a pilot randomised trial to minimise the overall trial sample size for the external pilot and main trial for a continuous outcome variableAmy Whitehead, Michael J. Campbell, Steven A. Julious et al.|Statistical Methods in Medical Research|2015Cited by 2k
Estimating sample sizes for binary, ordered categorical, and continuous outcomes in two group comparisonsMichael J. Campbell, David Altman, Steven A. Julious|BMJ|1995Cited by 480
The statistical interpretation of pilot trials: should significance thresholds be reconsidered?Ellen Lee, Steven A. Julious, Amy Whitehead et al.|BMC Medical Research Methodology|2014Cited by 445
Problems with the performance of the SF-36 among people with type 2 diabetes in general practiceAlison Woodcock, Michael J. Campbell, Steven A. Julious et al.|Quality of Life Research|2001Cited by 83
Tutorial in biostatistics: sample sizes for parallel group clinical trials with binary dataSteven A. Julious, Michael J. Campbell|Statistics in Medicine|2012Cited by 62