If not, then we can use the following formula (provided r ≠ ☑): This version of the Spearman-Brown correction works properly when the two halves have equal length. This result shows that the test is quite reliable. To get a better estimate of the reliability of the full test, we apply the Spearman-Brown correction, namely: One problem with the split-half reliability coefficient is that since only half the number of items is used the reliability coefficient is reduced. See Basic Concepts of Correlation for more information about the correlation coefficient r. If it is high then the questionnaire is considered to be reliable. The statistical test consists of looking at the correlation coefficient (cell G3 of Figure 1). Determine whether the test is reliable by using the split-half methodology.įigure 1 – Split-half methodology for Example 1 For each student, the total score is recorded along with the sum of the scores for the even questions and the sum of the scores for the odd question as shown in Figure 1. Another approach, which is applicable to questionnaires, is to divide the test into even and odd questions and compare the results.Įxample 1: 12 students take a test with 50 questions. One way to test the reliability of a test is to repeat the test.
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