A Conditional Logit Approach to U.S. State-to-State Migration

This paper uses a conditional logit approach to study interstate migration in the United States for each of eleven years, from 1986–1987 to 1996–1997. We test substantive hypotheses regarding migration in the United States and demonstrate the richness of the conditional logit approach in studies of place-to-place migration. We investigate migration responses to relative economic opportunities (unemployment rate, per capita income) and the associated costs of moving (distance between origin and destination and its square). We also investigate how noneconomic factors, such as amenities, affect migration between states through a state fixed effect. Finally, we study the magnitude of unmeasured costs associated with a particular migration. The conditional logit model also allows us to compute various trade-off and other values that are of interest in migration analysis.     

A Revision to the U.S. Southwest Archaeomagnetic Master Curve

Recently, two problems have been recognized with the United States Southwest archaeomagnetic master curve (Eighmy, 1991; LaBelle & Eighmy, 1997; Sternberg, 1989). One of these problems, the damping problem, is inherent to the moving window method of curve construction proposed by Sternberg (1989). The other is due to the fact that the small number of independently dated virtual geomagnetic pole determinations available for the period between 900–1100 are not representative of secular variation during this period. The analyses presented here confirm the existence of these two problems and suggest that they distort the curve by less than 1·0° and between 1·0° and 2·0° respectively. Based on these findings, a new curve is proposed for the U.S. Southwest.     

美国对以色列的政策及美以关系的发展（1948-1958）

以色列是在美国的支持下建立的。战后,美国通过插手巴勒斯坦事务,逐步从英国手中夺取处理该地区事务的主动权。在以色列建国伊始,美国给予这一新生国家巨大的帮助。但在战略上,美国并未将以色列视作特别重点考虑对象。在第二次中东战争结束以后,以色列开始受到特别关注,其在美中东战略中的地位和作用日渐突出。本文利用美国解密的档案材料及国内外学者的有关著述,对以建国初期(1948至1958年)美国对以色列的策略及美以关系的发展进行梳理与分析,希望有助于深刻理解美以特殊战略关系的形成及美以关系发展的现状。     

A Methodology for Estimating Returns to Skills for Canadian Provinces and U.S. States

Differences in both regional skill prices and skill mix can explain interregional variations in wage distributions. We control for interregional differences in skill mix that permit us to compute key parameters of regional wage distributions including regional returns to skills. In addition to setting forth the methods in detail, we also present estimates for 48 U.S. states and 10 Canadian provinces. For both males and females, we find that regional mean wages (with controls for skills mix) in the U.S. and Canada are similar, but that the returns to skills are systematically higher in the U.S.