Shirin, I prefer to think about validity as a process rather than as a 'thing'. Validation is a process by we we judge how good a measure is a measuring what it purports to measure. This involves many different approaches to validation, such as experts agreeing that the questions are appropriate (face validity), the questions hang together in a meaningful way (construct validity), that the scores correlate with measures of similar variables (convergent validity) etc etc. So the process of validation does not have an end point when some statistical estimate is calculated, it's just part of the process of accumulating evidence.
Mark
Shirin, I prefer to think about validity as a process rather than as a 'thing'. Validation is a process by we we judge how good a measure is a measuring what it purports to measure. This involves many different approaches to validation, such as experts agreeing that the questions are appropriate (face validity), the questions hang together in a meaningful way (construct validity), that the scores correlate with measures of similar variables (convergent validity) etc etc. So the process of validation does not have an end point when some statistical estimate is calculated, it's just part of the process of accumulating evidence.
Mark
Dear Shirin
Validity (content, construct, criterion, and face) is established using a group of 5 ( 5 to 10) experts and a field test.
I think that you are asking about reliability of the questionnaire.
To conduct reliability analysis, the Cronbach' alfa coefficient can be calculated for each item measured in Likert scale.
In SPSS you can use: Analyze -> Scale -> Reliability analysis
select all the items you need and then click on Statistics and select item, scale and scale if item deleted, then continue and obtain the outputs.
Hope this tutorial will help you.
For more information please read the information in the link below:
https://joe.org/joe/2007february/tt2.php
Best regards,
Alma
I agree with Dr. Alma Braimllari Spaho answer, you can follow it
One of the methods that can measure the validity of the questionnaire is the arbitration of the questionnaire by the arbitrators.
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