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Entropy 2010, 12(2), 161-163; doi:10.3390/e12020161
Letter

Quantifying Information Content in Survey Data by Entropy

1,*  and 2
1 Helse Sør-Øst Health Services Research Centre, Akershus University Hospital, Mail drawer 95, NO-1474 Lørenskog, Norway 2 The National Resource Centre in Rheumatology, Diakonhjemmet hospital, P.O. Box 23 Vinderen, NO-0319 Oslo, Norway
* Author to whom correspondence should be addressed.
Received: 4 November 2009 / Revised: 6 January 2010 / Accepted: 26 January 2010 / Published: 28 January 2010
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Abstract

We apply Shannon entropy as a measure of information content in survey data, and define information efficiency as the empirical entropy divided by the maximum attainable entropy. In a case study of the Norwegian Function Assessment Scale, entropy calculations show that the 5-point response version has higher information efficiency than the 4-point version.
Keywords: entropy; information; survey; data; questionnaire entropy; information; survey; data; questionnaire
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Dahl, F.A.; Østerås, N. Quantifying Information Content in Survey Data by Entropy. Entropy 2010, 12, 161-163.

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