UDIFF: Stata module to estimate the generalized unidiff model for individual-level data

Ben Jann and Simon Seiler

Statistical Software Components from Boston College Department of Economics

Abstract: udiff estimates parameters of the so-called unidiff model (Erikson and Goldthorpe 1992: The Constant Flux. Oxford University Press), also known as the log-multiplicative layer effect model (Xie 1992: The Log-Multiplicative Layer Effect Model for Comparing Mobility Tables. American Sociological Review 57: 380–395), which is often used to study differences in intergenerational class mobility between birth cohorts or countries. The original unidiff model has been expressed as a log-linear model of cell frequencies in a three-way contingency table (origin by destination by cohort or country). The model, however, can also be expressed at the individual-level (similar to a multinomial logit model). udiff estimates such a re-expressed unidiff model for individual-level data. Furthermore, it generalizes the model to allow for multiple layers and non-categorical predictors. For an implementation of the classic log-linear unidiff model for aggregate data see Pisati (2000: sg142: Uniform layer effect models for the analysis of differences in two-way associations. Stata Technical Bulletin 55: 33-47).

Language: Stata
Requires: Stata version 11
Keywords: unidiff; log-multiplicative layer effect model; social mobility (search for similar items in EconPapers)
Date: 2019-11-09, Revised 2020-04-03
Note: This module should be installed from within Stata by typing "ssc install udiff". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
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http://fmwww.bc.edu/repec/bocode/u/udiff.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/udiff_lf.mata program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/udiff.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/u/udiff_lf.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/udiff_p.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/udiff_estat.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/l/ludiff.mlib Mata object library (application/x-stata)
http://fmwww.bc.edu/repec/bocode/u/udiff.zip zip file of package (application/zip)

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