A semiparametric inverse-Gaussian model and inference for survival data with a cured proportion

Sangbum Choi, Xuelin Huang, Janice N. Cormier, Kjell A. Doksum

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


This work focuses on a semiparametric analysis of a cure rate modelling approach based on a latent failure process. In clinical and epidemiological studies, a Wiener process with drift may represent a patient's health status and a clinical endpoint occurs when the process first reaches an adverse threshold state. The first-hitting-time then follows an inverse-Gaussian distribution. On the basis of the improper inverse-Gaussian distribution, we consider a process-based lifetime model that allows for a positive probability of no event taking place in finite time. Model flexibility is achieved by leaving a transformed time measure for disease progression completely unspecified, and regression structures are incorporated into the model by taking the acceleration factor and the threshold parameter as functions of the covariates. When applied to experiments with a cure fraction, this model is compatible with classical two-mixture or promotion-time cure rate models. We develop an asymptotically efficient likelihood-based estimation and inference procedure and derive the large-sample properties of the estimators. Simulation studies demonstrate that the proposed method performs well in finite samples. A case study of stage-III soft tissue sarcoma data is used as an illustration.

Original languageEnglish
Pages (from-to)635-649
Number of pages15
JournalCanadian Journal of Statistics
Issue number4
Publication statusPublished - 2014 Dec 1
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2014 Statistical Society of Canada.


  • Degradation model
  • First-hitting-time
  • Improper distribution
  • Nonparametric likelihood
  • Threshold regression
  • Transformation model
  • Wiener process

ASJC Scopus subject areas

  • Statistics and Probability
  • Statistics, Probability and Uncertainty


Dive into the research topics of 'A semiparametric inverse-Gaussian model and inference for survival data with a cured proportion'. Together they form a unique fingerprint.

Cite this