I am investigating a new topic with an established questionnaire. However some items are not suitable so the scales are not the best predictors in my hierarchical regression (n.s.). However, some other items of another questionnaire are far better and belong to the same scale (rated by five idependet experts).

This leads to the idea to develope a new questionnaire that is a mixture of both.

Unfortunately both questionnaires have different Likert scales (5 vs. 7). The endings are the same but not the number of graduation. Is it still possible to put them in the same scale if they are z-standardized.

Thank you for your help.

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