THE MASSACHUSETTS' GUN CONTROL LAW WAS FORMALLY PLACED IN OPERATION IN APRIL 1975. THE BOSTON DATA ARE ANALYZED FOR THE PERIOD FROM JANUARY 1966 TO OCTOBER 1975. THE ANALYSIS INDICATES A STATISTICALLY SIGNIFICANT DECREASE IN ARMED ROBBERY AND ASSAULT WITH A GUN, BUT NOT IN HOMICIDE, DURING THE TIME PERIOD EXAMINED. THE ANALYSIS ALSO SUGGESTS A PROBABLE DIRECT ASSOCIATION BETWEEN THE DECREASES AND THE INTRODUCTION AND ENACTMENT OF THE LAW. FOR ARMED ROBBERY, A 27 PERCENT DECREASE WAS SEEN IN THE MONTHS IMMEDIATELY FOLLOWING PASSAGE OF THE GUN CONTROL LAW. METHODOLOGICAL DETAILS, SUPPORTING DATA, AND A LIST OF REFERENCES ARE INCLUDED.
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