Dear All,
The next meeting of the Northern Ireland Local Group of the RSS will
take place on Wednesday 7th December at 4PM in Room 211 in the Peter
Froggatt Centre at the Queen's University Belfast. All are welcome.
Speaker: Mike Stevenson (Clinical Research Centre at the Royal Group of
Hospitals)
Topic: Quality of Life – Issues for Ordinal Outcomes
Abstract:
The increasing importance of quality of life measurement in recent years
has raised the profile of methods for analysis of ordinal variables.
Traditional approaches include dichotomising ordinal variables and
applying binary logistic models, or combining ordinal variables into a
composite score and applying linear models. Newer approaches include
ordinal regression models based on cumulative probability distributions
and Rasch models. Internal consistency of composite psychometric scores
are often assessed using Cronbach’s alpha. A paradox between Cronbach
and Rasch approaches will be revealed and a compromise suggested!
Alan Gordon
Biometrics Branch
DARD Science Service*
Food Science Centre
Newforge Lane
Belfast
BT9 5PX
tel: 028 902 55532
fax: 028 902 55008
email: [log in to unmask]
[*From 1 April 2006, DARD Science Service and the Agricultural Research
Institute of Northern Ireland will combine to form a new DARD
Non-Departmental Public Body, the "Agri-Food and Biosciences Institute"
(AFBI).]
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