

Traffic(MASS)                                R Documentation

_E_f_f_e_c_t _o_f _S_w_e_d_i_s_h _S_p_e_e_d _L_i_m_i_t_s _o_n _A_c_c_i_d_e_n_t_s

_D_e_s_c_r_i_p_t_i_o_n_:

     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.

_A_r_g_u_m_e_n_t_s_:

    year: 1961 or 1962

     day: of year

   limit: was there a speed limit?

       y: traffic accident count for that day

_F_o_r_m_a_t_:

     This data frame contains the following columns:

_S_o_u_r_c_e_:

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

