Asymptotic normality of nonparametric M-estimators with applications to hypothesis testing for panel count data

Xingqiu Zhao, Ying Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


In semiparametric and nonparametric statistical inference, the asymptotic normality of estimators has been widely established when they are consistent. In many applications, nonparametric estimators are not able to achieve this rate. We have a result on the asymptotic normality of nonparametric M-estimators that can be used if the rate of convergence of an estimator is n or slower. We apply this to study the asymptotic distribution of sieve estimators of functionals of a mean function from a counting process, and develop nonparametric tests for the problem of treatment comparison with panel count data. The test statistics are constructed with spline likelihood estimators instead of nonparametric likelihood estimators. The new tests have a more general and simpler structure and are easy to implement. Simulation studies show that the proposed tests perform well even for small sample sizes. We find that a new test is always powerful for all the situations considered and is thus robust. For illustration, a data analysis example is provided.
Original languageEnglish
Pages (from-to)931-950
Number of pages20
JournalStatistica Sinica
Issue number2
Publication statusPublished - 1 Apr 2017


  • Asymptotic normality
  • M-estimators
  • Nonparametric maximum likelihood
  • Nonparametric maximum pseudo-likelihood
  • Nonparametric tests
  • Spline

ASJC Scopus subject areas

  • Statistics and Probability
  • Statistics, Probability and Uncertainty

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