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The reliability of a two-item scale: Pearson, Cronbach, or Spearman-Brown?

The reliability of a two-item scale: Pearson, Cronbach, or Spearman-Brown? Int J Public Health (2013) 58:637–642 DOI 10.1007/s00038-012-0416-3 HIN T S & KIN K S The reliability of a two-item scale: Pearson, Cronbach, or Spearman-Brown? • • Rob Eisinga Manfred te Grotenhuis Ben Pelzer Received: 10 January 2012 / Revised: 27 June 2012 / Accepted: 24 September 2012 / Published online: 23 October 2012 Swiss School of Public Health 2012 Introduction two-item scales. Quite the contrary, having only two items to identify an underlying construct has been recognized as To obtain reliable measures researchers prefer multiple-item problematic for some time and we support the claim that questionnaires rather than single-item tests. Multiple-item using more items is better, particularly in exploratory questionnaires may be costly however and time-consuming research (Herbert et al. 1998; Little et al. 1999; Emons for participants to complete. They therefore frequently et al. 2007). The use of multiple, heterogeneous indicators administer two-item measures, the reliability of which is enhances construct validity in the sense that it increases the commonly assessed by computing a reliability coefficient. likelihood of adequately identifying the construct of There is some disagreement, however, what the most interest. Also, assessments used for individual diagnosis, appropriate indicator of scale reliability is when a measure http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Public Health Springer Journals

The reliability of a two-item scale: Pearson, Cronbach, or Spearman-Brown?

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References (20)

Publisher
Springer Journals
Copyright
Copyright © 2012 by Swiss School of Public Health
Subject
Medicine & Public Health; Public Health; Occupational Medicine/Industrial Medicine; Environmental Health
ISSN
1661-8556
eISSN
1661-8564
DOI
10.1007/s00038-012-0416-3
pmid
23089674
Publisher site
See Article on Publisher Site

Abstract

Int J Public Health (2013) 58:637–642 DOI 10.1007/s00038-012-0416-3 HIN T S & KIN K S The reliability of a two-item scale: Pearson, Cronbach, or Spearman-Brown? • • Rob Eisinga Manfred te Grotenhuis Ben Pelzer Received: 10 January 2012 / Revised: 27 June 2012 / Accepted: 24 September 2012 / Published online: 23 October 2012 Swiss School of Public Health 2012 Introduction two-item scales. Quite the contrary, having only two items to identify an underlying construct has been recognized as To obtain reliable measures researchers prefer multiple-item problematic for some time and we support the claim that questionnaires rather than single-item tests. Multiple-item using more items is better, particularly in exploratory questionnaires may be costly however and time-consuming research (Herbert et al. 1998; Little et al. 1999; Emons for participants to complete. They therefore frequently et al. 2007). The use of multiple, heterogeneous indicators administer two-item measures, the reliability of which is enhances construct validity in the sense that it increases the commonly assessed by computing a reliability coefficient. likelihood of adequately identifying the construct of There is some disagreement, however, what the most interest. Also, assessments used for individual diagnosis, appropriate indicator of scale reliability is when a measure

Journal

International Journal of Public HealthSpringer Journals

Published: Oct 23, 2012

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