قارن الطرق

	UNIDIFF Mobility Model	Social Mobility Table
المجال	Sociology	Sociology
العائلة	Regression model	Process / pipeline
سنة النشأة	1992	1927 (concept); 1970s–1980s (modern analysis)
صاحب الطريقة	Yu Xie; Robert Erikson & John Goldthorpe (parallel)	Pitirim Sorokin; refined by Hauser, Hout, Featherman
النوع	Log-multiplicative model for comparing association across tables	Cross-classification of social origins by destinations
المصدر التأسيسي	Xie, Y. (1992). The log-multiplicative layer effect model for comparing mobility tables. American Sociological Review, 57(3), 380–395.	Hauser, R. M. (1978). A structural model of the mobility table. Social Forces, 56(3), 919–953.
الأسماء البديلة	UNIDIFF model, log-multiplicative layer effect model, uniform difference model, Xie-Erikson-Goldthorpe model	mobility table, intergenerational mobility table, origin-destination table, transition table analysis
ذات صلة	4	5
الملخص	The uniform difference (UNIDIFF) model, equivalently the log-multiplicative layer effect model, compares the strength of origin–destination association across several mobility tables — countries, time periods, or birth cohorts. It assumes the tables share a common pattern of association ψ_ij but allows the overall strength of that pattern to differ by a single layer-specific multiplier φ_k. A φ_k above one means stronger origin effects (less fluidity) in that layer; below one means greater fluidity.	A social mobility table is a cross-classification of individuals by their social origin (typically a parent's class or occupation) and their own destination class, forming the empirical foundation of intergenerational mobility research. Analyzing it separates how much people move between classes, distinguishes movement forced by changing class sizes from genuine exchange, and isolates the underlying origin–destination association that measures the openness of a society.