Validity and reliability are two fundamental elements in the evaluation of a measurement instrument. Instruments can be conventional knowledge, skill or aptitude tests, or survey questionnaires. Cronbach’s alpha is the most widely used objective measure of reliability among Medical educators. Therefore, can we use this measure to validate a questionnaire regardless of the discipline/ field of study or has anyone practically used this method?
Hi Achinthya,
Yes, you can perform a Cronbach's alpha test on your questionnaire. However, it is not the only measure to validate a questionnaire. The test tells you that your items measure the same concept (or not), it's called a measure of internal consistency. To validate a questionnaire, you need to test several psychometrical properties (e.g., content validity, construct validity, test-retest, ...). I suggest you to have a look on this topic in RG, especially Paul's answer: https://www.researchgate.net/post/What_is_the_best_method_to_validate_a_questionnaire_based_on_a_5_point_Likert_scale
It is a long work to create a questionnaire, good luck for your project.
I hope these elements will help,
Julian
Hi Achinthya,
Yes, you can perform a Cronbach's alpha test on your questionnaire. However, it is not the only measure to validate a questionnaire. The test tells you that your items measure the same concept (or not), it's called a measure of internal consistency. To validate a questionnaire, you need to test several psychometrical properties (e.g., content validity, construct validity, test-retest, ...). I suggest you to have a look on this topic in RG, especially Paul's answer: https://www.researchgate.net/post/What_is_the_best_method_to_validate_a_questionnaire_based_on_a_5_point_Likert_scale
It is a long work to create a questionnaire, good luck for your project.
I hope these elements will help,
Julian
Cronbach's alpha coefficient is used for measuring the validity and reliability (internal and external) of questionnaire in the scientific research, In order to know the validity and reliability of the study scale within the questionnaire, this method should be used
yes of course you cn use it for each measure in you questionnaire
I think the Cronbach alpha can only "validate" the fact that the items may be measuring a certain construct(s) (reliability). Now, whether that specific construct is initially what the questionnaire meant to measure (validity) is another question.
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