PT  - JOURNAL ARTICLE
AU  - Mohammed A Mohammed
AU  - Roger Holder
TI  - Introducing analysis of means to medical statistics
AID  - 10.1136/bmjqs-2011-000477
DP  - 2012 Jun 01
TA  - BMJ Quality & Safety
PG  - 529--532
VI  - 21
IP  - 6
4099  - http://qualitysafety.bmj.com/content/21/6/529.short
4100  - http://qualitysafety.bmj.com/content/21/6/529.full
SO  - BMJ Qual Saf2012 Jun 01; 21
AB  - Statistical hypothesis testing involving the comparison of three or more means and/or proportions is a frequent undertaking in medical statistics. For comparison of means, analysis of variance is a common choice and for comparison of proportions, χ2 tests are common. However, both these approaches have important limitations which include the need for post hoc testing to identify the unusual group(s) without an integral graphical device to present the final results. These limitations are elegantly overcome by the analysis of means, which is widely used in industrial statistics, and illustrated here using means and proportions.