1. While developing a questionnaire related to a particular brand, I am using 7 point likert scales for all construct except attitude towards brand. Attitude is measured through a 7 point semantic scale. Is this feasible for future analysis using PLS?
2. Some of the adapted items originally measured through 5 point likert scale. In my study, I am measuring the constructs using same items in 7 point likert scale. Is this possible to do?
Yes, it is feasible to use both 7-point Likert scales and 7-point semantic differential scales in a Partial Least Squares Structural Equation Modeling (PLS-SEM) analysis. However, there are a few important considerations to ensure valid and reliable analysis:
PLS-SEM is quite flexible and does not require strict assumptions about the scale type, as long as the measurement levels are interval or treated as quasi-interval — which is commonly accepted for both Likert-type and semantic differential scales with 7 points.
While it is, actually, feasible, using the same scale might elevate the threat of common method bias. Therefore, I do not consider using the 5-point scale for one of the constructs and the 7-poitn scale for the other as a weird idea.
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