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- W1970849062 abstract "The negative binomial (NB) is frequently used to model overdispersed Poisson count data. To study the effect of a continuous covariate of interest in an NB model, a flexible procedure is used to model the covariate effect by fixed-knot cubic basis-splines or B-splines with a second-order difference penalty on the adjacent B-spline coefficients to avoid undersmoothing. A penalized likelihood is used to estimate parameters of the model. A penalized likelihood ratio test statistic is constructed for the null hypothesis of the linearity of the continuous covariate effect. When the number of knots is fixed, its limiting null distribution is the distribution of a linear combination of independent chi-squared random variables, each with one degree of freedom. The smoothing parameter value is determined by setting a specified value equal to the asymptotic expectation of the test statistic under the null hypothesis. The power performance of the proposed test is studied with simulation experiments." @default.
- W1970849062 created "2016-06-24" @default.
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- W1970849062 date "2013-11-25" @default.
- W1970849062 modified "2023-09-25" @default.
- W1970849062 title "Testing the linearity of negative binomial regression models" @default.
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- W1970849062 doi "https://doi.org/10.1080/00949655.2013.860138" @default.
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