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An Application of the Generalized Poisson Model for Over Dispersion Data on The Number of Strikes Between 1984 and 2017

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  • Burcu Durmuş
  • Öznur İşçi Güneri

Abstract

Poisson regression analysis is widely used in many studies including count data. Poisson regression analysis is based on the assumption of equal mean and variance. However, this assumption is quite difficult in regression models. In cases where the assumption is not provided, over dispersion or under dispersion occurs. Over dispersion in data occurs when the variance of the dependent variable is greater than the average. This results in lower estimates than the standard errors. The generalized Poisson regression model is one of the methods used in case of over dispersion. This model is a generalization of Poisson regression. In this study, Poisson regression and generalized Poisson regression methods were used in the modelling of count data for determinants of strikes between 1984 and 2017. According to empirical results, while all explanatory variables of the Poisson regression model were significant, the unemployment rate was found to be insignificant for the generalized Poisson regression model. This result was evaluated considering the structure of the data.

Suggested Citation

  • Burcu Durmuş & Öznur İşçi Güneri, 2020. "An Application of the Generalized Poisson Model for Over Dispersion Data on The Number of Strikes Between 1984 and 2017," Alphanumeric Journal, Bahadir Fatih Yildirim, vol. 8(2), pages 249-260, December.
    • Handle: RePEc:anm:alpnmr:v:8:y:2020:i:2:p:249-260
    DOI: http://dx.doi.org/10.17093/alphanumeric.670611
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    More about this item

    Keywords

    Count Data; Generalized Poisson Model; Over Dispersion; Strike Numbers;
    All these keywords.

    JEL classification:

    • C46 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: Special Topics - - - Specific Distributions

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