can some one help please?

- Thread starter jimmy41324
- Start date
- Tags analysis likert scale statistics

can some one help please?

What you can do is to calculate medianscores from the likertscale questions and compare those with nonparametric tests such as Mann-Whitney. But it depends on what your research question is, if you want to compare two or more independent groups or if you want to study changes within a group etc.

i hope this makes it clearer

Without starting a holy war, I wonder what other researchers think about this question. In practice, is it possible to treat data from well-constructed Likert scales as interval data? Will it play in Peoria?

Aaron

i hope this makes it clearer

adelwich: Yes, researchers such as psychometricians not only get away with it, they often have to do so to get published in scientific papers.. How can one treat a variable derived from sums from "scores" on ordinal scales (measuring for instance feelings) as an interval, equidistant and often normaldistributed variable? It's more tradition than science.

Yes, researchers such as psychometricians not only get away with it, they often have to do so to get published in scientific papers.. How can one treat a variable derived from sums from "scores" on ordinal scales (measuring for instance feelings) as an interval, equidistant and often normaldistributed variable? It's more tradition than science.

because the assumption is that such score is the manifested version of a continuous (or interval, whatever you wanna call it) latent variable... now, i've always felt kind of iffy about likert scales with like 4 or 5 points but, if my memory is correct, i can point out towards one or two monte carlo studies in which they show that after i believe either 11 or 13 likert scale points, analysing such scales as interval/continuous or categorical data makes no practical difference in terms of results, stability of models, accuracy of standard errors, etc...

Then you can test your hypotheses. One thing you can do is calculate the mean for each factor.

If all of your data are Likert scale including the ease of use, then you may want to use correlation/regression.

yes all the questions use the likert scale rating

Well, you can make assumptions about everything I guess. But is it an assumtion that is testable? How will you know that the steps in the scale are equidistant (even if it measures som kind of underlying continous variable)?