Time series analysis is used to analyze intensive longitudinal data such as those obtained with ecological momentary assessments, experience sampling methods, daily diary methods, and ambulatory assessments. Such data typically have a large number of time points, for example, twenty to two hundred. The measurements are typically closely spaced in time.
Multilevel time series analysis of intensive longitudinal data typically considers time points nested within individuals. Individual differences in level-1 parameters such as the mean, variance, and autocorrelation are represented as random effects that are modeled on level 2 in a two-level analysis.
Mplus Version 8, released April 20, 2017, offers two-level, cross-classified, as well as single-level (N=1) time series analysis. In cross-classified analysis the random effects are allowed to vary not only across individuals but also across time to represent time-varying effects.
Mplus can estimate a variety of N=1, two-level and cross-classified time series models. These include univariate autoregressive, regression, cross-lagged, confirmatory factor analysis, Item Response Theory, and structural equation models for continuous, binary, ordered categorical (ordinal), or combinations of these variable types. Bayesian analysis is used in the estimation using a flexible latent variable modeling framework referred to as dynamic structural equation modeling (DSEM).
DSEM and RDSEM Theory
The following papers discuss multilevel time series analysis modeling and estimation:
- Asparouhov, T. & Muthén, B. (2018). Comparison of models for the analysis of intensive longitudinal data. Accepted for publication in Structural Equation Modeling: A Multidisciplinary Journal. Version 3, May 15, 2019.
- Asparouhov, T. & Muthén, B. (2018). Latent variable centering of predictors and mediators in multilevel and time-series models. Structural Equation Modeling: A
Multidisciplinary Journal, DOI: 10.1080/10705511.2018.1511375 (Download scripts).
- Asparouhov, T., Hamaker, E.L. & Muthen, B. (2018). Dynamic structural equation models. Structural Equation Modeling: A Multidisciplinary Journal, 25:3, 359-388, DOI: 10.1080/10705511.2017.1406803 (Download Mplus analyses)
- Asparouhov, T., Hamaker, E.L. & Muthén, B. (2017). Dynamic Latent Class Analysis. Structural Equation Modeling: A Multidisciplinary Journal, 24:2, 257-269, DOI: 10.1080/10705511.2016.1253479
The following papers discuss multilevel time series analysis applications:
- McNeish, D. & Hamaker, E.L. (2018). A primer on two-level dynamic structural equation models for intensive longitudinal data. PsyArXiv. November 28. doi:10.31234/osf.io/j56bm. (Supplementary material).
- Öhrlund, I., Schultzberg, M. & Bartusch, C. (2019). Identifying and estimating the effects of a mandatory billing demand charge. Applied Energy, 237, 885-895. DOI: 10.1016/j.apenergy.2019.01.028
- Joly-Burra, E., Van der Linden, M. & Ghisletta, P. (2018). Intraindividual variability in inhibition and prospective memory in healthy older adults: Insights from response regularity and rapidity. Journal of Intelligence, 6(1), 13. DOI: 10.3390/jintelligence6010013
- Hamaker, E.L., Asparouhov, T., Brose, A., Schmiedek, F. & Muthén, B. (2018). At the frontiers of modeling intensive longitudinal data: Dynamic structural equation models for the affective measurements from the COGITO study. Multivariate Behavioral Research, DOI: 10.1080/00273171.2018.1446819 (Online supporting material).
- Schultzberg, M. & Muthén, B. (2018). Number of subjects and time points needed for multilevel time series analysis: A simulation study of dynamic structural equation modeling. Structural Equation Modeling: A Multidisciplinary Journal, 25:4, 495-515, DOI:10.1080/10705511.2017.1392862. (Supplementary material).
DSEM in Mplus Version 8 was presented to the Prevention Science Methodology Group (PSMG) in March and April 2017. Following are links to videos and handouts from these occasions:
DSEM Examples in the Mplus Version 8 User’s Guide
- N=1 time series analysis: User’s Guide ex 6.23 – 6.28
- Two-level time series analysis: User’s Guide ex 9.30 – 9.37
- Cross-classified time series analysis: User’s Guide ex 9.38 – 9.40
RDSEM Examples in the Version 8.1 Mplus Language Addendum
These and other examples can be found in our User's Guide.