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Researchers propose a parametric model for long-term follow-up.(breast cancer)(Brief Article)
2003 APR 10 - (NewsRx.com & NewsRx.net) -- Researchers propose a parametric model for long-term follow-up.
According to recent research from the United States, "We propose a parametric version of a univariate gamma frailty model."
"The proposed model is shown to be flexible enough to model long-term follow-up survival data from breast cancer clinical trials when the treatment effect diminishes as time progresses, a case for which neither the proportional hazards nor proportional odds assumptions are satisfied," wrote J.H. Jeong and colleagues, University of Pittsburgh, Department of Biostatistics.
"The observed information matrix is computed to evaluate the variances of parameter estimates. A simple parametric test statistic to test proportional odds assumption is also constructed. The model is ...
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