Migration is only rarely analyzed from a population perspective, unlike the two other main demographic processes, fertility and mortality. This study shows how standard demographic methodology can be used to study internal migration from both a period and cohort perspective at the population level. I present data and results by calculating the total migration rate (TMigR) on period and cohort data. I use administrative register data for the years from 1970 to 2012 on all inter-parish migration

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... vents for the complete population of Sweden. I present both age-specific migration rates as well as TMigR for Sweden. The results overall show an increased concentration of migration events into early adulthood, while total migration frequencies over the life course remained overall stable since 1970 with a small decline in the 1980s. Cohort rates show less fluctuation over time than period rates. The study shows the usefulness of taking a population level approach to migration, and to examine cohort and period trends simultaneously. These methods can easily be extended by decomposing data into different distance thresholds, as well as by migration order given applicable data. All the period and cohort data are available as an online supplement. 3