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Article: Evaluation of internal reliability in the presence of inconsistent responses

TitleEvaluation of internal reliability in the presence of inconsistent responses
Authors
Issue Date2010
PublisherBioMed Central Ltd. The Journal's web site is located at http://www.hqlo.com/home/
Citation
Health And Quality Of Life Outcomes, 2010, v. 8 How to Cite?
AbstractBackground: We aimed to assess the impact of inconsistent responses on the internal reliability of a multi-item scale by developing a procedure to adjust Cronbach's alpha.Methods: A procedure for adjusting Cronbach's alpha when there are inconsistent responses was developed and used to assess the impact of inconsistent responses on internal reliability by evaluating the standard Chinese 12-item Short Form Health Survey in adolescents.Results: Contrary to common belief, random responses may inflate Cronbach's alpha when their mean differ from that of the true responses. Fixed responses inflate Cronbach's alpha except in scales with both positive and negative polarity items. In general, the bias in Cronbach's alpha due to inconsistent responses may change from negative to positive with an increasing number of items in a scale, but the effect of additional items beyond around 10 becomes small. The number of response categories does not have much influence on the impact of inconsistent responses.Conclusions: Cronbach's alpha can be biased when there are inconsistent responses, and an adjustment is recommended for better assessment of the internal reliability of a multi-item scale. © 2010 Fong et al; licensee BioMed Central Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/86624
ISSN
2015 Impact Factor: 2.212
2015 SCImago Journal Rankings: 1.020
PubMed Central ID
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorFong, DYTen_HK
dc.contributor.authorHo, SYen_HK
dc.contributor.authorLam, THen_HK
dc.date.accessioned2010-09-06T09:19:19Z-
dc.date.available2010-09-06T09:19:19Z-
dc.date.issued2010en_HK
dc.identifier.citationHealth And Quality Of Life Outcomes, 2010, v. 8en_HK
dc.identifier.issn1477-7525en_HK
dc.identifier.urihttp://hdl.handle.net/10722/86624-
dc.description.abstractBackground: We aimed to assess the impact of inconsistent responses on the internal reliability of a multi-item scale by developing a procedure to adjust Cronbach's alpha.Methods: A procedure for adjusting Cronbach's alpha when there are inconsistent responses was developed and used to assess the impact of inconsistent responses on internal reliability by evaluating the standard Chinese 12-item Short Form Health Survey in adolescents.Results: Contrary to common belief, random responses may inflate Cronbach's alpha when their mean differ from that of the true responses. Fixed responses inflate Cronbach's alpha except in scales with both positive and negative polarity items. In general, the bias in Cronbach's alpha due to inconsistent responses may change from negative to positive with an increasing number of items in a scale, but the effect of additional items beyond around 10 becomes small. The number of response categories does not have much influence on the impact of inconsistent responses.Conclusions: Cronbach's alpha can be biased when there are inconsistent responses, and an adjustment is recommended for better assessment of the internal reliability of a multi-item scale. © 2010 Fong et al; licensee BioMed Central Ltd.en_HK
dc.languageengen_HK
dc.publisherBioMed Central Ltd. The Journal's web site is located at http://www.hqlo.com/home/en_HK
dc.relation.ispartofHealth and Quality of Life Outcomesen_HK
dc.rightsHealth and Quality of Life Outcomes. Copyright © BioMed Central Ltd.en_HK
dc.titleEvaluation of internal reliability in the presence of inconsistent responsesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1477-7525&volume=8 article no. 27&spage=&epage=&date=2010&atitle=Evaluation+of+internal+reliability+in+the+presence+of+inconsistent+responsesen_HK
dc.identifier.emailFong, DYT: dytfong@hku.hken_HK
dc.identifier.emailHo, SY: syho@hku.hken_HK
dc.identifier.emailLam, TH: hrmrlth@hkucc.hku.hken_HK
dc.identifier.authorityFong, DYT=rp00253en_HK
dc.identifier.authorityHo, SY=rp00427en_HK
dc.identifier.authorityLam, TH=rp00326en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1186/1477-7525-8-24en_HK
dc.identifier.pmid20226019-
dc.identifier.pmcidPMC2842254-
dc.identifier.scopuseid_2-s2.0-77951174610en_HK
dc.identifier.hkuros169268en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77951174610&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume8en_HK
dc.identifier.isiWOS:000275909200001-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridFong, DYT=35261710300en_HK
dc.identifier.scopusauthoridHo, SY=7403716884en_HK
dc.identifier.scopusauthoridLam, TH=7202522876en_HK
dc.identifier.citeulike6711341-

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