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Grouped zero-inflated count data models of coital frequency

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  • Peter G. Moffatt

    ()
    (School of Economic and Social Studies, University of East Anglia, Norwich NR4 7TJ, UK)

  • Simon A. Peters

    ()
    (School of Economic Studies, University of Manchester, Manchester M13 9PL, UK)

Abstract

Various count data models are applied to data collected from a sample of Norfolk young persons, who were asked how many times they had had sexual intercourse during the previous two-week period. The models take account of the fact that the data are "grouped", meaning that for some observations, the count is not known exactly but is known to fall in a particular range. Using a formal testing procedure, we find overwhelming evidence of the presence of excess zeros, and this we attribute to the fact that, at any time, a certain proportion of the population are sexually inactive. Our final model contains two equations, the first being the participation equation which determines whether an individual is sexually active, and the second being the frequency equation which determines the count, conditional on being active. Age, gender, salary, occupational status, marital status and type of living environment all have interesting effects on either participation or frequency. Since a significant proportion of the original sample declined to reveal coital frequency, we address the potential problem of selection bias by including a Heckman-type correction term during the model selection process.

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Bibliographic Info

Article provided by Springer in its journal Journal of Population Economics.

Volume (Year): 13 (2000)
Issue (Month): 2 ()
Pages: 205-220

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Handle: RePEc:spr:jopoec:v:13:y:2000:i:2:p:205-220

Note: Received: 27 November 1998/Accepted: 19 May 1999
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Related research

Keywords: Grouped count data; Poisson regression; excess zeros; sample selection; coital frequency.;

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Cited by:
  1. David G. Blanchflower & Andrew J. Oswald, 2004. "Money, Sex, and Happiness: An Empirical Study," NBER Working Papers 10499, National Bureau of Economic Research, Inc.
  2. Sarah Brown & Alan S Duncan & Mark N Harris & Jennifer Roberts & Karl Taylor, 2014. "A Zero Inflated Regression Model for Grouped Data," Bankwest Curtin Economics Centre Working Paper series WP1401, Bankwest Curtin Economics Centre (BCEC), Curtin Business School.

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