{smcl} {* *! version 2.1.0 August 14, 2023 J. N. Luchman}{...} {cmd:help mixdom} {hline}{...} {title:Title} {pstd} Wrapper program for {cmd:domin} to conduct linear mixed effects regression dominance analysis{p_end} {title:Syntax} {phang} {cmd:mixdom} {it:depvar} {it:indepvars} {it:{help if}} {weight} {cmd:,} {opt id(idvar)} [{opt {ul on}re{ul off}opt(re_options)} {opt {ul on}m{ul off}opt(mixed_options)}] {phang}{cmd:pweight}s and {cmd:fweight}s are allowed (see help {help weights:weights}). {help fvvarlist:Factor} and {help tsvarlist:time series variables} are allowed. {title:Description} {pstd} {cmd:mixdom} sets the data up in a way to allow for the dominance analysis of a linear mixed effects regression by utilizing {help mixed}. The method outlined here follows that for the within- and between-cluster Snijders and Bosker (1994) R2 metric described by Luo and Azen (2013). {pstd} {cmd:mixdom} only allows 1 level of clustering in the data (i.e., 1 random effect), which must be the cluster constant/mean/intercept. Luo and Azen (2013) recommend that even if random coefficients are present in the data, they should be restricted to a fixed effect only in the dominance analysis. {pstd} {cmd:mixdom} is intended for use only as a wrapper program with {cmd:domin} for the dominance analysis of mixed-effects linear regression, and its syntax is designed to conform with {cmd:domin}'s expectations. It is not recommended for use as an estimation command outside of {cmd:domin}. {pstd} Note that negative R2 values indicate likely model misspecification. {marker options}{...} {title:Options} {phang}{opt id()} specifies the variable on which clustering occurs and that will appear after the random effects specification (i.e., ||) in the {cmd:mixed} syntax. {phang}{opt reopt()} passes options to {cmd: mixed} specific to the random intercept effect (i.e., {opt pweight()} the user would like to utilize during estimation. {phang}{opt mopt()} passes options to {cmd:mixed} that the user would like to utilize during estimation. This option was named {opt xtmopt()} in {cmd:mixdom} versions previous to 2.0.0 and is now defunct. {title:Saved results} {phang}{cmd:mixdom} saves the following results to {cmd: e()}: {synoptset 16 tabbed}{...} {p2col 5 15 19 2: scalars}{p_end} {synopt:{cmd:e(r2_w)}}within-cluster R2{p_end} {synopt:{cmd:e(r2_b)}}between-cluster R2{p_end} {p2col 5 15 19 2: macros}{p_end} {synopt:{cmd:e(title)}}"Mixed-effects ML regression"{p_end} {p2col 5 15 19 2: functions}{p_end} {synopt:{cmd:e(sample)}}marks estimation sample{p_end} {title:References} {p 4 8 2}Luo, W., & Azen, R. (2013). Determining predictor importance in hierarchical linear models using dominance analysis. {it:Journal of Educational and Behavioral Statistics, 38(1)}, 3-31.{p_end} {p 4 8 2}Snijders, T. A. B., & Bosker, R. J. (1994). Modeled variance in two-level models. {it:Sociological Methods & Research, 22(3)}, 342-363.{p_end} {title:Author} {p 4}Joseph N. Luchman{p_end} {p 4}Research Fellow{p_end} {p 4}Fors Marsh{p_end} {p 4}Arlington, VA{p_end} {p 4}jluchman@forsmarsh.com{p_end} {title:Also see} {psee} {manhelp mixed R}. {p_end}