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Threshold models in a methadone programme evaluation
A Saei1, J Ward, C A McGilchrist
1National Centre for Epidemiology and Population Health, Australian National University, Canberra, Australia.
Statistics in Medicine
|October 30, 1996
Abstract:
The degree of non-compliance with a methadone programme is such that a zero is often recorded as the response variable. Such outcome variables cannot be transformed to normality in order to investigate a regression relationship between the response variable and various risk or treatment variables. The presence of a random effect as well in this regression causes added difficulty in the analysis. We show here that use of threshold models can provide a satisfactory solution to both these problems.