Primary, return and onward migration in the U.S. and Canada: is there a difference?

"Using microdata sources available from the U.S. Census Bureau and Statistics Canada, this paper contrasts primary, return and onward migration in the two countries. These classifications are based on information on the region (state or province) of birth and region of residence at the start and end of the census period. To study the propensities to make a primary, return or onward migration, rates are calculated...and compared with previous census periods. Analysis reveals that both countries have experienced similar temporal patterns, and that primary, return and onward migration patterns tend to be similar. Analysis using a nested logit model further reveals that return and onward migration in both countries can be similarly explained." Data are from the Public Use Micro Sample (PUMS) for the United States and the Public Use Micro File (PUMF) for Canada.