Estimating Power and Sample Size - Stanford Medicine
Estimating Power and Sample Size
(How to Help Your Biostatistician!)
Amber W. Trickey, PhD, MS, CPH
Senior Biostatistician 1070 Arastradero #225 atrickey@stanford.edu
Goal: Effective Statistical Collaboration
[Pye, 2016]
Topics
Research Data
? Questions & Measures ? Hypothesis Testing
Statistical Power
? Components ? Assumptions
Statistical
? Consultation Process
Collaboration ? Timelines
Surgery Epidemiologist & Biostatistician
14 years
12 years
14 years
a while ago...
Epi
Stats
HSR
PhD, MS PhD, MS PhD
BioEng BS
Surgical HSR: 7 years
Research Question (PICO)
1. Patient population
? Condition / disease, demographics, setting, time
2. Intervention
? Procedure, policy, process, treatment
3. Comparison group
? Control group (e.g. no treatment, standard of care, non-exposed)
4. Outcome of interest
? Treatment effects, patient-centered outcomes, healthcare utilization
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