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Here's my internship paper with Francis Tuerlinckx on #measurement/#psychometrics of affect & #ESM using graded-response #IRT.
The main finding:
The state & trait latent constructs of affect—contrary to the common belief—are essentially different.
Summary in 9 tweets:
Nonergodicity has been heavily ignored in psychology. In the intro we give an extensive historical overview of how this has troubled our idiographic (person-centered) and nomothetic (~individual differences) understanding in psychology—and the way people have tried to fix it.
In #ESM, sum-scores of PANAS-like positive & negative items are used as constructs of affect—but is that a valid decission?
To account for non-normality (& to allow nonlinearity & check latent nonmonotonicity), we used graded-response item response theory for factor analysis.
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