Figure 6.18 shows the numbers of monthly deaths and serious injuries Y t , t _ 1 , . . . , 120, on…

Seat-belt legislation; SBL.TSM

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Figure 6.18 shows the numbers of monthly deaths and serious injuries Yt_ 1, . . . , 120, on UK roads for 10 years beginning in January 1975. They are filed as SBL.TSM. Seat-belt legislation was introduced in February 1983 in the hope of reducing the mean number of monthly “deaths and serious injuries,” (from = 99 onwards). In order to study whether or not there was a drop in mean from that time onwards, we consider the regression,

Ytbf (t) Wt, t = 1, . . . , 120,

 width=

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