Data collected in Colombia and Thailand in 1977 are used to "compare the employment and household characteristics of migrants before and after the move in order to assess the degree of change which accompanies migration. Moreover, these comparisons [are] made for migration streams between places at different levels in the urban hierarchy with the intention of determining within which streams the greatest transformations occur."

中文翻译：

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移民与就业和家庭结构的转变

1977 年在哥伦比亚和泰国收集的数据用于“比较迁移前后移民的就业和家庭特征，以评估伴随迁移的变化程度。此外，这些比较[是]针对不同地方之间的迁移流进行的在城市等级的不同层次上，目的是确定哪些河流中发生了最大的转变。”