TY - JOUR AU - Teare, M. Dawn AU - Dimairo, Munyaradzi AU - Shephard, Neil AU - Hayman, Alex AU - Whitehead, Amy AU - Walters, Stephen J. PY - 2014 DA - 2014/07/03 TI - Sample size requirements to estimate key design parameters from external pilot randomised controlled trials: a simulation study JO - Trials SP - 264 VL - 15 IS - 1 AB - External pilot or feasibility studies can be used to estimate key unknown parameters to inform the design of the definitive randomised controlled trial (RCT). However, there is little consensus on how large pilot studies need to be, and some suggest inflating estimates to adjust for the lack of precision when planning the definitive RCT. SN - 1745-6215 UR - https://doi.org/10.1186/1745-6215-15-264 DO - 10.1186/1745-6215-15-264 ID - Teare2014 ER -