Distribution-free estimation of zero-inflated models with unobserved heterogeneity

Rodica Gilles, Seik Kim

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


This paper presents a quasi-conditional likelihood method for the consistent estimation of both continuous and count data models with excess zeros and unobserved individual heterogeneity when the true data generating process is unknown. Monte Carlo simulation studies show that our zero-inflated quasi-conditional maximum likelihood (ZI-QCML) estimator outperforms other methods and is robust to distributional misspecifications. We apply the ZI-QCML estimator to analyze the frequency of doctor visits.

Original languageEnglish
Pages (from-to)1532-1542
Number of pages11
JournalStatistical Methods in Medical Research
Issue number3
Publication statusPublished - 2017 Jun 1


  • Excess zeros
  • nonnegative data
  • quasi-likelihood estimation
  • robust estimation
  • zero inflation

ASJC Scopus subject areas

  • Epidemiology
  • Statistics and Probability
  • Health Information Management


Dive into the research topics of 'Distribution-free estimation of zero-inflated models with unobserved heterogeneity'. Together they form a unique fingerprint.

Cite this