The Box-Jenkins interrupted time series design is suggested for use in evaluating the effects of social program intervention. This paper presents an example of a specific application to methadone maintenance treatment intervention for chronic heroin addicts. Using time series analysis, the present evaluation found that entry into methadone maintenance was followed by: 1) a decrease in daily heroin use, 2) a slight increase in daily marijuana use, and 3) an increase in regular employment.
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