Pharmacoeconomics: Open Access

ISSN: 2472-1042

Open Access

Martin Connock

University of Warwick, Warwick Medical School, Gibbet Hill road, CV47AL Coventry, UK

  • Research Article   
    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»
    DOI: 10.37421/2472-1042.2022.7.154

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