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Thread: A question regarding Cronbach's Alpha

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    A question regarding Cronbach's Alpha




    Hi everyone.

    I have been reading that Cronbach's Alpha is used when you need to test consistency of several Likert questions which all try to measure on single element, and that the individual scores of each question are to be summed together.

    Should we use Cronbach's Alpha to a set of questionnaire questions if each of the questions is trying to measure a different element?

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    Re: A question regarding Cronbach's Alpha

    Not unless you think that each question is getting at a related element of the same common construct.
    “In God we trust. All others must bring data.”
    ~W. Edwards Deming

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    Re: A question regarding Cronbach's Alpha


    Hi Jake, could you be so nice and expain to me what do you mean by saying "each question is getting at a related element of the same common contruct" ?

    In my case, I have 3 items:

    1. While watching the ad, I felt excited.
    2. While watching the ad, I fand the ad vivid.
    3. While watching the ad, there were too much information for me.

    and at the end of my questionair, I would ask
    4. How do you like the ad?

    I am quite a beginner so I would describe my understanding below and please correct me if I made any mistake:

    a. my first 3 questions is trying to measure 3 different elements (only emotional, emotional + cognitive, only cognitive)

    b. I would like to run a regression 4 ~ 1+ 2+ 3, in this case, each question is directing to the same common construct

    c.If there were no question 4, I don not need to test the Cronbach's Alpha. but if I took question 4 AND do a regression, I do need to check the Alpha, right?

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