Estimation and Forecasting Survival of Diabetic CABG Patients (Kalman Filter Smoothing Approach)

DOI: 10.4236/ajcm.2015.54035   PDF   HTML   XML   4,283 Downloads   4,778 Views  

Abstract

In this paper, we present a new approach (Kalman Filter Smoothing) to estimate and forecast survival of Diabetic and Non Diabetic Coronary Artery Bypass Graft Surgery (CABG) patients. Survival proportions of the patients are obtained from a lifetime representing parametric model (Weibull distribution with Kalman Filter approach). Moreover, an approach of complete population (CP) from its incomplete population (IP) of the patients with 12 years observations/follow-up is used for their survival analysis [1]. The survival proportions of the CP obtained from Kaplan Meier method are used as observed values yt at time t (input) for Kalman Filter Smoothing process to update time varying parameters. In case of CP, the term representing censored observations may be dropped from likelihood function of the distribution. Maximum likelihood method, in-conjunction with Davidon-Fletcher-Powell (DFP) optimization method [2] and Cubic Interpolation method is used in estimation of the survivor’s proportions. The estimated and forecasted survival proportions of CP of the Diabetic and Non Diabetic CABG patients from the Kalman Filter Smoothing approach are presented in terms of statistics, survival curves, discussion and conclusion.

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Saleem, M. , Khan, K. and Yasmin, N. (2015) Estimation and Forecasting Survival of Diabetic CABG Patients (Kalman Filter Smoothing Approach). American Journal of Computational Mathematics, 5, 405-413. doi: 10.4236/ajcm.2015.54035.

Conflicts of Interest

The authors declare no conflicts of interest.

References

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