TY - JOUR
T1 - Modeling Zero-Inflated and Overdispersed Count Data
T2 - An Empirical Study of School Suspensions
AU - Desjardins, Christopher David
PY - 2016/7/2
Y1 - 2016/7/2
N2 - The purpose of this article is to develop a statistical model that best explains variability in the number of school days suspended. Number of school days suspended is a count variable that may be zero-inflated and overdispersed relative to a Poisson model. Four models were examined: Poisson, negative binomial, Poisson hurdle, and negative binomial hurdle. Additionally, the probability of a student being suspended for at least 1 day was modeled using a binomial logistic regression model. Of the count models considered, the negative binomial hurdle model had the best fit. Modeling the probability of a student being suspended for at least 1 day using a binomial logistic regression model with interactions fit both the training and test data and had adequate fit. Findings here suggest that both the negative binomial hurdle and the binomial logistic regression models should be considered when modeling school suspensions.
AB - The purpose of this article is to develop a statistical model that best explains variability in the number of school days suspended. Number of school days suspended is a count variable that may be zero-inflated and overdispersed relative to a Poisson model. Four models were examined: Poisson, negative binomial, Poisson hurdle, and negative binomial hurdle. Additionally, the probability of a student being suspended for at least 1 day was modeled using a binomial logistic regression model. Of the count models considered, the negative binomial hurdle model had the best fit. Modeling the probability of a student being suspended for at least 1 day using a binomial logistic regression model with interactions fit both the training and test data and had adequate fit. Findings here suggest that both the negative binomial hurdle and the binomial logistic regression models should be considered when modeling school suspensions.
KW - count data
KW - hurdle
KW - overdispersed
KW - school suspensions
KW - zero-inflated
UR - http://www.scopus.com/inward/record.url?scp=84945144228&partnerID=8YFLogxK
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U2 - 10.1080/00220973.2015.1054334
DO - 10.1080/00220973.2015.1054334
M3 - Article
AN - SCOPUS:84945144228
VL - 84
SP - 449
EP - 472
JO - Journal of Experimental Education
JF - Journal of Experimental Education
SN - 0022-0973
IS - 3
ER -