Skip to contents

This dataset is simulated based on the data used in Section 4.1 of Sørensen et al. (2023) .

Usage

lifespan

Format

lifespan A data frame with 54,457 rows and 7 columns:

id

Subject ID.

domain

Cognitive domain being measured. One of "epmem" for episodic memory, "wmem" for working memory and "execfun" for executive function/speed.

timepoint

Integer indicating the timepoint number.

age

Age of participant at the timepoint.

test

The particular test at this observation.

y

Response. For "epmem" and "wmem" this is the number of successes in 16 trials. For "execfun" it is the time in seconds to complete the task.

retest

Integer indicating whether the participant has taken the test at a previous timepoint.

domainepmem

Dummy variable for domain=="epmem".

domainwmem

Dummy variable for domain=="wmem".

domainexecfun

Dummy variable for domain=="execfun".

References

Sørensen Ø, Fjell AM, Walhovd KB (2023). “Longitudinal Modeling of Age-Dependent Latent Traits with Generalized Additive Latent and Mixed Models.” Psychometrika, 88(2), 456--486. ISSN 1860-0980, doi:10.1007/s11336-023-09910-z .