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Thread: Likert Analysis

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    Likert Analysis




    Hi all,

    I'm doing some analysis of survey data for a research project.

    On the broadest level, I have data from art teachers about all sorts of things. They were asked if they identify as artists or teachers, and I am doing analysis on items to see what differences there are.

    One item I am looking at is "average time spent art making." I have four years of survey data.

    I used Mann-Whitney U tests on responses from each survey to compare the artitsts and the teachers.

    Now what I want to do is to look longitudinally, essentially wanting to know is there a difference in the amount of time an artist spends making at at t=1 to t=4, and is that difference statistically significant.

    I'm unsure on which tests I should be using. One person suggested a one-way ANOVA, but I read that can only be used on ordinal data. Is there something else I should be looking to use? I guess part of it comes from me being unsure in the exact survey design being employed.

    Does the study design constitute a repeated measures design, or is it something different?

    Many thanks in advance!
    Last edited by scottwc; 11-09-2014 at 11:38 PM.

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    Re: Likert Analysis


    One person suggested a one-way ANOVA,
    This is inapproriate if you want to analyse longitudinal
    (repeated measures) data.
    but I read that can only be used on ordinal data.
    No. First of all, assumption for ANOVA is that variables are
    measured on an interval scale. Second, even if you have
    a test which can deal with ordinal data (like the Kruskal-
    Wallis H-Test, or the U-test which you have already
    performed), such a test can deal with interval scaled
    data also.
    Is there something else I should be looking to use? I guess part of it comes from me being unsure in the exact survey design being employed.
    Seems like you could have a look at repeated-measured
    (mixed) ANOVA, with time as within-subjects factor "time"
    and a grouping factor teacher/artist.

    With kind regards

    K.

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