University of Warwick, Warwick Medical School, Gibbet Hill road, CV47AL Coventry, UK
When do Rayleigh and Weibull Parametric Models Predict the Same Results?
Author(s): Martin Connock*, Mubarak Patel, Daniel Gallacher and Aileen Clarke
Background: Most Health Technology Appraisals (HTA) model survival data using a conventional set of six parametric distributions. Alternative and potentially useful distributions exist and could also be exploited. Rayleigh 2 parameter (R2P) and Weibull models are both defined with two parameters and exhibit monotonic hazard; the Rayleigh model is relatively unused in HTA and should not be regarded as just a special case of the Weibull model. Aim: To explore circumstances where the predictions from R2P and Weibull models may differ or coincide. Method: Stata software was used to model sample survival data with R2P and Weibull models and to compare the predicted hazard and survival from each parametric. Results: R2P models generate different predictions to Weibull models except in.. Read More»
Pharmacoeconomics: Open Access received 67 citations as per Google Scholar report