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lme4 and nlme are R packages used for fitting linear, generalized linear and nonlinear mixed effects models. For general questions about mixed models use [mixed-model] tag.

lme4 and nlme are R packages used for fitting linear, generalized linear and nonlinear mixed-effects models. For further information check Bates (June 25, 2010), Bates et al (2014), and Pinheiro and Bates (2000).