Long-term immigration to the United States: new approaches to measurement.

"The United Nations has recommended the measurement of types of international migration using demographic criteria, including length of stay and purpose of travel. Information systems at the U.S. Immigration and Naturalization Service (INS) have the potential to provide a basis for documenting these demographic characteristics, in particular, length of stay of temporary migrants to the United States. This article analyzes these characteristics of selected categories of nonimmigrant aliens. The results of the analysis are used to produce series of estimates of alien immigration that conform more closely to the U.N. recommended definitions and better represent demographic concepts of long-term immigration. A strategy for measuring emigration of aliens from the United States using INS information systems is also described." excerpt