

   EEffffeecctt ooff SSwweeddiisshh SSppeeeedd LLiimmiittss oonn AAcccciiddeennttss

   AArrgguummeennttss::

       year: 1961 or 1962

        day: of year

      limit: was there a speed limit?

          y: traffic accident count for that day

   SSUUMMMMAARRYY::

        An experiment was performed in Sweden in 1961-2 to
        assess the effect of a speed limit on the motorway
        accident rate.  The experiment was conducted on 92 days
        in each year, matched so that day `j' in 1962 was com-
        parable to day `j' in 1961.  On some days the speed
        limit was in effect and enforced, while on other days
        there was no speed limit and cars tended to be driven
        faster.  The speed limit days tended to be in contigu-
        ous blocks.

   DDAATTAA DDEESSCCRRIIPPTTIIOONN::

        This data frame contains the following columns:

   SSOOUURRCCEE::

        Svensson, A. (1981) On the goodness-of-fit test for the
        multiplicative Poisson model.  Annals of Statistics, 9
        697-704.

