The reliability of a two-item scale: Pearson, Cronbach, or Spearman-Brown? Golden trophy for IJPH paper!
We were happy to be informed that a recent IJPH paper has been identified as a “highly cited paper ” in “Essential Science Indicators” in Web of Science, which resulted in the award of a golden trophy (virtual, I presume!)
The paper is called “The reliability of a two-item scale: Pearson, Cronbach, or Spearman-Brown” and belongs to our Hints and Kinks* section. The paper aims to clear the confusion regarding which is the most appropriate reliability indicator for 2-item scales: the most frequently used Cronbach’s alpha coefficient or -as suggested by others- Pearson or Spearman-Brown?
We welcome any comments on this paper and/or your submissions to our Hints and Kinks section (see below for details)
*Hints and Kinks are short methodological reports (1000 words max., no abstract) presenting topics relevant in survey research and surveillance. They report on experiences with techniques in a variety of areas and topics, such as writing questions, questionnaire design, survey implementation, or new and original ways to show results.