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Modelling zero inflated and under-reported count data.
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- Author(s): Sengupta, Debjit; Roy, Surupa
- Source:
Journal of Statistical Computation & Simulation; Sep2023, Vol. 93 Issue 14, p2390-2409, 20p- Subject Terms:
- Source:
- Additional Information
- Abstract: Poisson distribution is a classic choice for modelling unbounded count data. However, count data arising in various fields of scientific research often have excess zeros and are under-reported. In such situations, Poisson distribution gives a poor fit and Poisson model based inferences lead to biased estimators and inaccurate confidence intervals. In this paper we develop a flexible model which can accommodate excess zeros and undercount. Internal validation data has been used for making likelihood based inferences. The impact of ignoring undercount and excess zeros are studied through extensive simulations. The finite sample behaviour of the estimators are investigated through bootstrap methodology. Finally, a real life data which is supposedly under-reported and known to have excess zeros is analysed. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Journal of Statistical Computation & Simulation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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