r multilevel-models brms linear-mixed-models covariance variance-components mixed-models random-effects lme4 hierarchical-linear-models random-intercepts random-slopes generalized-linear-mixed-models crossed-random-effects nested-random-effects nlme glmmtmb

machine-learning regression supervised-learning jupyter-notebooks ridge-regression unsupervised-learning social-sciences gradient-boosting mean-shift k-means-clustering random-intercepts random-slopes life-expectancy mixed-effects-models thiel-sen