title: Modelling sparse interaction matrices:  interward migration in Hereford and Worcester, and the underdispersion problem.
abstract: The use of the Poisson regression approach to the modeling of migration is evaluated using 1981 census data on migration for Hereford and Worcester County, England.  "It is shown that for this exceedingly sparse data set the deviance figures attained are very low, suggesting that there may be a problem of underdispersion....A simulation approach to the assessment of model goodness of fit is suggested, and the results from applying it to the Hereford and Worcester data set are described."
authors.forename: P J
authors.initials: PJ
authors.lastname: Boyle
authors.forename: R
authors.initials: R
authors.lastname: Flowerdew
mesh_terms: D003710:Demography; D019049:Developed Countries; D004641:Emigration and Immigration; D004739:England; D005060:Europe; D008722:Methods; D008962:Models, Theoretical; D011153:Population; D011157:Population Dynamics; D012106:Research; D012107:Research Design; D006113:United Kingdom
keywords: Demographic Factors; Developed Countries; England; Error Sources; Europe; Measurement; Methodological Studies; Migration; Models, Theoretical; Northern Europe; Population; Population Dynamics; Research Methodology; United Kingdom