R Function for multiple-level multi-group decomposition

This R script provides a function to perform a multiple-level multi-group decomposition for the analysis of the ethnic achievement gap, as described in the article 'Decomposing ethnic achievement gaps across multiple levels of analysis and for multiple ethnic groups' published in the journal Sociological Methodology. Gallo Cordoba B, Leckie G, Browne W.J. Decomposing Ethnic Achievement Gaps across Multiple Levels of Analysis and for Multiple Ethnic Groups. Sociological Methodology. pp. 1-31. Copyright [June 2022] (American Sociological Association). doi: 10.1177/00811750221099503