Power, effect and sample size using GPower: Practical issues for researchers and members of research ethics committees

Evidence Based Midwifery

Volumn 5, Issue 4, 2007, Pages 132-136

  Cunningham, Joseph B ^a   McCrum Gardner, Evelyn ^a  

^a UNIVERSITY OF ULSTER   (United Kingdom)

Author keywords

Beta level; Effect size; Gpower; Power; Research ethics committees; Sample size

Indexed keywords

EID: 67651162382     PISSN: 14794489     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (14)

1. Altman DG. (1981) Statistics and ethics in medical research: how large a sample? Br Med ] 281(6251): 1336-8.
2. Bacchetti P, Leslie E, Wolf LE, Segal MR, McCulloch CE. (2005) Ethics and sample size. Am ] Epidemiol 161(2): 105-10.
3. Brown BW, Brauner C, Chan A, Gutierrez D, Herson J, Lovato J, Polsley J, Russell K, Venier J. (2000) BAM software download site: STPLAN software. The University of Texas MD Anderson Center: Houston, Texas. See: http://biostatistics.mdanderson.org/SoftwareDownload/SingleSoftware. aspxSoftware-Id=41 (accessed 18 September 2007).
4. Buchner A, Erdfelder E, Faul F. (1997) How to use GPower. Heinrich-Heine- Universitat: Du̇sseldorf. See: www.psycho.uni-duesseldorf. de/aap/projects/gpower/how-to-use-gpower.html (accessed 20 November 2007).
5. Burns R. (1785) To a mouse: In: Noble A, Hogg P. (Eds.). (2003) The Canongate Burns: the complete poems and songs of Robert Burns. Canongate: Edinburgh.
6. Camacho-Sandoval J. (2007) GPower tutorial. Heinrich-Heine- Universitat: Dusseldorf. See: www.psycho.uni-duesseldorf.de/aap/projects/gpower/ gpower-tutorial.pdf (accessed 18 September 2007).
7. Central Office for Research Ethics Committees. (2007) Question-specificguidance on NHS research ethics committee application. See: http://83.138.142.202/corecformDocs/Question-Specific-Guidance.pdf (accessed 11 June 2007).
8. Cohen J. (1988) Statistical power analysis for the behavioural sciences (second edition). Lawrence Earlbaum Associates: Hillsdale, New Jersey.
9. Devane D, Begley C, Clarke M. (2004) How many do I need? Basic principles of sample size estimation. JAN 47(3): 297-302.
10. Dupont WD, Plummer WD. (1997) PS power and sample size program available for free on the internet. Controlled Clin Trials 18(3): 274.
11. Field A. (2005) Discovering statistics using SPSS. Sage: London.
12. Kerrison S, Pollock AM. (2005) The reform of UK research ethics committees: throwing the baby out with the bath water? / Medical Ethics 31(8): 487-9.
13. Lenth RV. (2001) Some practical guidelines for effective sample-size determination. University of Iowa: Iowa City, Iowa. See: www.stat.uiowa.edu/ techrep/tr303.pdf (accessed 18 September 2007).
14. National Patient Safety Agency. (2007) National Research Ethics Service: UK Ethics Committee Authority-recognised research ethics committees. See: www.nres.npsa.nhs.uk/applicants/help/contacts/ recsrecognised.htm (accessed 18 September 2007).