U.S. Justice Department: Does Neighborhood Watch reduce crime? Neighborhood Watch programs became popular in the 1970s and 1980s; by 2000, roughly 40% of the U.S. residential population was covered by such citizen crime-watching programs.
Definition of actuarial. 1  1 : of or relating to actuaries. 2  2 : relating to statistical calculation especially of life expectancy.
Actuarial science includes a number of interrelated subjects, including mathematics, probability theory, statistics, finance, economics, and computer science. Historically, actuarial science used deterministic models in the construction of tables and premiums. The science has gone through revolutionary changes during the last 30 years due to the proliferation of high speed computers and the union of stochastic actuarial models with modern financial theory (Frees 1990).