Comparing Measurement Reliability Estimation Techniques: Correlation Coefficient vs. Bland–Altman Plot

ABSTRACT

The aim of this study is to compare the results of correlation coefficient estimation of reliability with those obtained through the Bland–Altman plot technique. The scale was first divided into two halves using three different approaches. A linear and high-level relationship was found between the scale scores obtained from the halved forms. However, there was disagreement between the scores obtained from Form A and B, as well as between Form C and D. Agreement was found between the scores obtained from Form E and F.

KEYWORDS:

• Bland–Altman agreement plot
• estimating reliability
• correlation coefficient
• equivalent forms
• testing

Disclosure statement

No potential conflict of interest was reported by the author(s).