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To use such data for predicting feelings, beliefs, and behavior, recent methodological work suggested combinations of the longitudinal mixed-effect model with Lasso regression or with regression trees. The present article adds to this literature by suggesting an extension of these models that\u2014in addition to a random effect for the mean level\u2014also includes a random effect for the within-subject variance and a random effect for the autocorrelation. After introducing the extended mixed-effect location scale (\n                    <jats:italic>E-MELS<\/jats:italic>\n                    ), the extended mixed-effect location-scale Lasso model (\n                    <jats:italic>Lasso E-MELS<\/jats:italic>\n                    ), and the extended mixed-effect location-scale tree model (\n                    <jats:italic>E-MELS trees<\/jats:italic>\n                    ), we show how its parameters can be estimated using a marginal maximum likelihood approach. Using real and simulated example data, we illustrate how to use E-MELS, Lasso E-MELS, and E-MELS trees for building prediction models to forecast individuals\u2019 daily nervousness. The article is accompanied by an R package (called mels) and functions that support users in the application of the suggested models.\n                  <\/jats:p>","DOI":"10.1007\/s11336-021-09787-w","type":"journal-article","created":{"date-parts":[[2021,8,14]],"date-time":"2021-08-14T07:02:52Z","timestamp":1628924572000},"page":"506-532","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["A Lasso and a Regression Tree Mixed-Effect Model with Random Effects for the Level, the Residual Variance, and the Autocorrelation"],"prefix":"10.1017","volume":"87","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9724-2441","authenticated-orcid":false,"given":"Steffen","family":"Nestler","sequence":"first","affiliation":[{"name":"University of M\u00fcnster, Institut f\u00fcr Psychologie"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah","family":"Humberg","sequence":"additional","affiliation":[{"name":"University of M\u00fcnster, Institut f\u00fcr Psychologie"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2025,1,1]]},"reference":[{"key":"S0033312300007857_CR57","doi-asserted-by":"publisher","DOI":"10.1037\/a0016973"},{"key":"S0033312300007857_CR45","doi-asserted-by":"publisher","DOI":"10.1080\/10705511.2018.1558060"},{"key":"S0033312300007857_CR41","doi-asserted-by":"publisher","DOI":"10.1198\/tast.2010.09058"},{"key":"S0033312300007857_CR14","first-page":"662","article-title":"Puffed up but shaky selves: State self-esteem level and variability in narcissists","volume":"76","author":"Geukes","year":"2017","journal-title":"Journal of Personality and Social Psychology"},{"key":"S0033312300007857_CR39","doi-asserted-by":"publisher","DOI":"10.1111\/bmsp.12196"},{"key":"S0033312300007857_CR19","doi-asserted-by":"publisher","DOI":"10.1007\/s11222-012-9359-z"},{"key":"S0033312300007857_CR58","unstructured":"Therneau, T. & Atkinson, B. 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