Testing the trade impact of institutional changes: A switching regression analysis of the EC'sss soybeanimports
研究欧共体制度变化（如共同农业政策引入、成员国扩大）是否导致其大豆进口需求的结构性变化，使用转换回归分析1964-1983年数据，发现结构性变化发生在1977/1978年，但并非由制度变化引起。
This study tests the hypothesis that institutional changes in the EC (introduction of CAP, enlargements by Denmark, Ireland, UK and Greece) caused structural changes in its import demand for soybeans. It used a simultaneous equation system approach to estimate EC's soybean import demand. A switching regression was used to identify structural changes from 1964 to 1983. It was found that structural changes occurred in 1977/1978 period. No structural shifts were found to have been caused by institutional changes.