Segmented Assimilation Test

Classic assimilation theory predicts that each immigrant generation moves uniformly toward the mainstream, shedding ethnic distinctiveness and rising in status over time. Segmented assimilation rejects the single path: it holds that the second generation can assimilate upward into the middle class, downward into a marginalized underclass, or selectively by advancing while retaining co-ethnic ties. The difference is testable through interaction effects — straight-line theory implies the return to parental resources is roughly constant across groups, whereas segmentation implies that return is conditioned by the group's mode of incorporation.

Modes of incorporation are the structural conditions a group meets on arrival: government policy and legal status, the receiving society's attitudes including racial prejudice, and the presence and strength of a co-ethnic community. Portes and Zhou argue these contexts, not individual effort alone, channel children toward different destinations — a hostile reception and concentrated disadvantage can pull a child downward despite ambition, while favorable policy and a resourceful community can lift one upward. They are the central explanatory variables of the framework and enter the empirical test as the factors that interact with parental background.

This is the selective-acculturation prediction. Retaining the parental language and identity keeps the family hierarchy intact, so parents retain authority and can transmit ambition and discipline; it also embeds the child in a co-ethnic network that supplies social capital and shields against oppositional peer cultures in disadvantaged neighborhoods. Empirically, the test looks for a positive marginal effect of co-ethnic embeddedness on attainment, which would contradict the assimilationist assumption that ethnic retention is a drag and confirm that, under the right conditions, it is protective.