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Article: Sensitivity of score tests for zero-inflation in count data

TitleSensitivity of score tests for zero-inflation in count data
Authors
KeywordsInfluential observations
Poisson regression
Score test
Zero-inflated negative binomial
Zero-inflated Poisson
Issue Date2004
PublisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www.interscience.wiley.com/jpages/0277-6715/
Citation
Statistics In Medicine, 2004, v. 23 n. 17, p. 2757-2769 How to Cite?
AbstractIn many biomedical applications, count data have a large proportion of zeros and the zero-inflated Poisson regression (ZIP) model may be appropriate. A popular score test for zero-inflation, comparing the ZIP model to a standard Poisson regression model, was given by van den Broek. Similarly, for count data that exhibit extra zeros and are simultaneously overdispersed, a score test for testing the ZIP model against a zero-inflated negative binomial alternative was proposed by Ridout, Hinde and Demétrio. However, these test statistics are sensitive to anomalous cases in the data, and incorrect inferences concerning the choice of model may be drawn. In this paper, diagnostic measures are derived to assess the influence of observations on the score statistics. Two examples that motivated the application of zero-inflated regression models are considered to illustrate the importance of sensitivity analysis of the zero-inflation tests. Copyright © 2004 John Wiley & Sons, Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/82890
ISSN
2015 Impact Factor: 1.533
2015 SCImago Journal Rankings: 1.811
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLee, AHen_HK
dc.contributor.authorXiang, Len_HK
dc.contributor.authorFung, WKen_HK
dc.date.accessioned2010-09-06T08:34:34Z-
dc.date.available2010-09-06T08:34:34Z-
dc.date.issued2004en_HK
dc.identifier.citationStatistics In Medicine, 2004, v. 23 n. 17, p. 2757-2769en_HK
dc.identifier.issn0277-6715en_HK
dc.identifier.urihttp://hdl.handle.net/10722/82890-
dc.description.abstractIn many biomedical applications, count data have a large proportion of zeros and the zero-inflated Poisson regression (ZIP) model may be appropriate. A popular score test for zero-inflation, comparing the ZIP model to a standard Poisson regression model, was given by van den Broek. Similarly, for count data that exhibit extra zeros and are simultaneously overdispersed, a score test for testing the ZIP model against a zero-inflated negative binomial alternative was proposed by Ridout, Hinde and Demétrio. However, these test statistics are sensitive to anomalous cases in the data, and incorrect inferences concerning the choice of model may be drawn. In this paper, diagnostic measures are derived to assess the influence of observations on the score statistics. Two examples that motivated the application of zero-inflated regression models are considered to illustrate the importance of sensitivity analysis of the zero-inflation tests. Copyright © 2004 John Wiley & Sons, Ltd.en_HK
dc.languageengen_HK
dc.publisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www.interscience.wiley.com/jpages/0277-6715/en_HK
dc.relation.ispartofStatistics in Medicineen_HK
dc.rightsStatistics in Medicine. Copyright © John Wiley & Sons Ltd.en_HK
dc.subjectInfluential observationsen_HK
dc.subjectPoisson regressionen_HK
dc.subjectScore testen_HK
dc.subjectZero-inflated negative binomialen_HK
dc.subjectZero-inflated Poissonen_HK
dc.titleSensitivity of score tests for zero-inflation in count dataen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0277-6715&volume=23&spage=2757&epage=2769&date=2004&atitle=Sensitivity+of+score+tests+for+zero-inflation+in+count+dataen_HK
dc.identifier.emailFung, WK: wingfung@hku.hken_HK
dc.identifier.authorityFung, WK=rp00696en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/sim.1828en_HK
dc.identifier.pmid15316956en_HK
dc.identifier.scopuseid_2-s2.0-4444380177en_HK
dc.identifier.hkuros104755en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-4444380177&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume23en_HK
dc.identifier.issue17en_HK
dc.identifier.spage2757en_HK
dc.identifier.epage2769en_HK
dc.identifier.isiWOS:000223525600009-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLee, AH=26643271800en_HK
dc.identifier.scopusauthoridXiang, L=7102911425en_HK
dc.identifier.scopusauthoridFung, WK=13310399400en_HK

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