Dahlberg A, Holmlund B
Demography. 1978 Aug;15(3):259-66.
A common approach in migration studies is to explain interregional migration by single-equation models. Such models are likely to suffer from simultaneous-equation bias when used in studies attempting to analyze migration over a long period of time. In this study, a simultaneous-equation appraoch is applied, which takes account of the interdependence between migration and income and employment changes. The four-equation model is estimated for 70 labor market areas in Sweden.
移民研究中的一种常见方法是用单方程模型来解释区域间移民现象。当在试图分析长期移民情况的研究中使用这类模型时，它们很可能会受到联立方程偏差的影响。在本研究中，采用了一种联立方程方法，该方法考虑到了移民与收入及就业变化之间的相互依存关系。针对瑞典的70个劳动力市场区域估计了四方程模型。
