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Statistical notes for clinical researchers: Sample size calculation 1. comparison of two independent sample means

Authors :
Hae Young Kim
Source :
Restorative Dentistry & Endodontics, Restorative Dentistry & Endodontics, Vol 41, Iss 1, Pp 74-78 (2016)
Publication Year :
2016

Abstract

Asking advice about sample size calculation is one of frequent requests from clinical researchers to statisticians. Sample size calculation is essential to obtain the results as the researcher expects as well as to interpret the statistical results as reasonable one. Usually insignificant results from studies with too small sample size may be subjects to suspicion about false negative, and also significant ones from those with too large sample size may be subjects to suspicion about false positive. In this article, the principles in sample size calculation will be introduced and practically some examples will be displayed using a free software, G*Power.1

Details

ISSN :
22347658
Volume :
41
Issue :
1
Database :
OpenAIRE
Journal :
Restorative dentistryendodontics
Accession number :
edsair.doi.dedup.....b4b77baefbd99332c3d0085b653df278