4.5 Reliability Analysis

Reliability assesses the consistency of a measurement. There are several indices for measuring the reliability/internal consistency of a measurement instrument. We used the Cronbach’s alpha (Cronbach 1951) to examine the reliability of each factor. A factor is considered reliable if the Cronbach alpha is at least 0.70. If the alpha level is less than 0.70, you need to explore the results for alpha if item is deleted. This provides information on which item can result in higher alpha value when it is excluded from the analysis. Because not to delete item because you desire higher alpha value, support your decision with tangible reasons.


Cronbach, Lee J. 1951. “Coefficient Alpha and the Internal Structure of Tests.” Psychometrika 16 (3): 297–334.