Department of Psychology and Child Development
Items are questions included in a survey, personality test, job evaluation, performance evaluation, educational evaluation, or in a program evaluation process.
Before creating new items, you need to ask to yourself?
These are examples extracted from the Minnesota Multiphasic Personality Inventory (MMPI) Test:
Note
Isabel conducted a study to evaluate if there was an effect of baby formula on total fat in 1 year old babies. In this study, she had two groups, one group were babies fed with baby formula only, the other group were breast fed babies. Which option corresponds to the best model or the best models to analyze the data? (2 points)
Classical Regression Model.
t-test for paired samples.
t-test for independent samples.
Options 1 and 3 would be the best choices.
I explained a little bit about it in this slide: CLICK HERE
The main point of Likert scales is to assign ordered numeric values to ratings of opinions, thoughts, beliefs, and attitudes.
This is also a peculiar use of a Likert scale:
You may read more about this item in this presentation, CLICK HERE
Item Response Theory (IRT) is a paradigm that answers some questions generated by the Classical Test Theory (CTT). It also helps to create more realistic and useful statistical models.
IRT will assume that there is a “latent trait” behind your items, then your items are goind to be explained by this latent trait.
Scale in IRT: