TRADE CENTER EVOLUTION IN THE GREAT PLAINS*
研究了加拿大萨斯喀彻温省贸易中心系统在1961至1981年间规模、间距和功能的变化，用聚类分析和判别分析验证分类，试图解释观察到的变化。
ABSTRACT Empirical analysis has lagged behind the impressive additions to the theoretical literature on trade center systems during the past 15 years. This study of the trade center system in Saskatchewan is an attempt to begin to redress the imbalance and to test some of the recently formulated theoretical propositions. Communities are identified according to functional classifications for 1961 and 1981 with the aid of a cluster analysis program, and the validity of the groupings are verified using multiple discriminant analysis. Changes in the size, spacing, and function of clusters and individual communities during the 20‐year interval are described and an effort is made to prdvide explanations for the changes observed.