The Negative and Positive Affect Scale (NAPAS) is Invariant across Age and Time

What is it about?

It is important for longitudinal study to use surveys that measure the same thing over time and across age groups. This allows researchers to know whether the observed changed or group differences are due to actual changes/differences or measurement issues. This study examines whether the widely used NAPAS measures the same thing over twenty years and across adulthoods.

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Why is it important?

Findings of this study supports a good psychometric properties of the NAPAS by showing that it assesses the same construct over twenty years and across age and gender groups.