PARAMETRIC ANALYSIS OF INTERVAL-CENSORED SURVIVAL DATA WITH NONCONTACT SHAPE PARAMETERS

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BAGHESTANI A.R.; HAJIZADEH E.

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Journal: JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY) Year:2011 | Volume:20 | Issue:78/2 (MATHEMATICS ISSUE) Page(s): 1-8

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Title

PARAMETRIC ANALYSIS OF INTERVAL-CENSORED SURVIVAL DATA WITH NONCONTACT SHAPE PARAMETERS

Author(s)

BAGHESTANI A.R. | HAJIZADEH E. | Issue Writer Certificate

Keywords

INTERVAL CENSORINGQ3

WEIBULL SURVIVAL MODELQ3

NONCONSTANT SHAPE PARAMETERQ3

AICQ3

Abstract

Introduction: In most survival studies for parametric analysis of data is used the weibull model because it is flexibility. In most cases for weibull model is assumed that the shape parameter is constant, although this assumption for some of the data is wrong.Aim: In this study, we present interval censored method for weibull distribution when the shape parameter isn' t constant.Materials and Methods: With simulation of Monte Carlo, we will present advantages of this approach respect to situation that shape parameter is constant. Then in a practical example we would show that how estimates are determined.Results: Estimation of model coefficient, DIC and Hazard ratio were calculated in model with constant and NONCONSTANT SHAPE PARAMETER then were compared. The results indicated that if the shape parameter of distribution isn' t constant. The estimation of covariates coefficients has less bias, more appropriate fit and the results is different respect to shape parameter is constant.Conclusion: Based on the results is better than the saturated model is selected in such a way that does not assume constant shape parameter to be fixed parameter used as the test model, using appropriate criteria to select fit model.

Cites

APPLICATION OF PARAMETRIC MODELS OF SURVIVAL ANALYSIS IN DETERMINING THE CANCER INFLUENCING FACTORS IN PATIENTS WITH THYROID NODULES

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APA: Copy

BAGHESTANI, A.R., & HAJIZADEH, E.. (2011). PARAMETRIC ANALYSIS OF INTERVAL-CENSORED SURVIVAL DATA WITH NONCONTACT SHAPE PARAMETERS. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), 20(78/2 (MATHEMATICS ISSUE)), 1-8. SID. https://sid.ir/paper/70428/en

Vancouver: Copy

BAGHESTANI A.R., HAJIZADEH E.. PARAMETRIC ANALYSIS OF INTERVAL-CENSORED SURVIVAL DATA WITH NONCONTACT SHAPE PARAMETERS. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)[Internet]. 2011;20(78/2 (MATHEMATICS ISSUE)):1-8. Available from: https://sid.ir/paper/70428/en

IEEE: Copy

A.R. BAGHESTANI, and E. HAJIZADEH, “PARAMETRIC ANALYSIS OF INTERVAL-CENSORED SURVIVAL DATA WITH NONCONTACT SHAPE PARAMETERS,” JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), vol. 20, no. 78/2 (MATHEMATICS ISSUE), pp. 1–8, 2011, [Online]. Available: https://sid.ir/paper/70428/en

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