Abstract
A number of methods has been proposed for dealing with single-factor or factorial experiments when the requirements for performing the normal theory analysis of variance procedure are not satisfied. This paper suggests the use of the likelihood ratio statistic for testing the main effects and the interaction between the factors in two-way layout of count data following negative binomial distributions with a common dispersion parameter. The likelihood ratio statistic for testing the equality of the dispersion parameters of several groups of count data is also derived. The methods is illustrated by an example concerning the study of spatial and temporal variation of bacterial counts.
Similar content being viewed by others
References
AnscombeF. J.: 1948, ‘The Transformation of Poisson, Binomial and Negative Binomial Data’, Biometrikla 38, 246–254.
AnscombeF. J.: 1949, ‘The Analysis of Insect Counts Based on the Negative Binomial Distribution’, Biometrics 5, 165–173.
BarnwallR. K. and PaulS. R.: 1988, ‘Analysis of One-Way Layout of Count Data with Negative Binomial variation’, Biometrika 75, 215–222.
BlissC. I. and FisherR. A.: 1953, ‘Fitting the Negative Binomial Distribution to Biological Data’, Biometrics 9, 176–200.
El-ShaarawiA. H., EsterbyS. R., and DutkaB. J.: 1981, ‘Bacterial Density in Water Determined by Poisson or Negative Binomial Distributions’, Appl. Environ. Microbiol. 41, 107–116.
LawlessJ. F.: 1987, ‘Negative Binomial and Mixed Poisson Regression’, Can. J. Statist. 15, 205–225.
MaulA. and BlockJ. C.: 1983, ‘Microplate Fecal Coliform Method to Monitor Strea Water Pollution’, Appl. Environ. Microbiol. 46, 1032–1037.
MaulA., El-ShaarwaiA. H., and BlockJ. C.: 1985, ‘Heterotrophic Bacteria in Water Distribution Systems, I. Spatial and Temporal Variation, II. Sampling Design for Monitoring’, Sci. Total Environ. 44, 201–224.
Maul. A., El-Shaarawi, A. H., and Ferard, J. F.: 1989, ‘Application of Negative Binomial Regression Models to the Analysis of Quantal Bioassays Data’, Environmetrics (to appear).
SchefféH.: 1959, The Analysis of Variance, John Wiley, New York.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Maul, A., El-Shaarawi, A.H. Analysis of two-way layout of count data with negative binomial variation. Environ Monit Assess 17, 315–322 (1991). https://doi.org/10.1007/BF00399311
Issue Date:
DOI: https://doi.org/10.1007/BF00399311