Spline-based semiparametric estimation of a zero-inflated Poisson regression single-index model

Minggen Lu, Chin-Shang Li

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


When the number of zeros in a count dataset exceeds the accommodation of the probability mass of a regular Poisson distribution at zero, the zero-inflated Poisson (ZIP) distribution is often used. To characterize the potential non-linear effects of covariates and avoid the “curse of dimensionality”, we propose a spline-based ZIP regression single-index model. B-splines are employed to estimate the unknown smooth function. A modified Fisher scoring method is proposed to simultaneously estimate the linear coefficients and the regression function. It is shown that the spline estimator of the nonparametric component is uniformly consistent, and achieves the optimal convergence rate under the smooth condition, and that the estimators of regression parameters are asymptotically normal and efficient. The spline-based semiparametric likelihood ratio test is also established. Moreover, a direct and consistent variance estimation method based on least-squares estimation is proposed. Simulations are performed to evaluate the proposed method.

Original languageEnglish (US)
JournalAnnals of the Institute of Statistical Mathematics
StateAccepted/In press - Jul 2 2015


  • B-spline
  • Likelihood estimator
  • Single-index model
  • Zero-inflated Poisson regression

ASJC Scopus subject areas

  • Statistics and Probability


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