prop.trend.test            package:stats            R Documentation

_T_e_s_t _f_o_r _t_r_e_n_d _i_n _p_r_o_p_o_r_t_i_o_n_s

_D_e_s_c_r_i_p_t_i_o_n:

     Performs chi-squared test for trend in proportions, i.e., a test
     asymptotically optimal for local alternatives where the log odds
     vary in proportion with 'score'.  By default, 'score' is chosen as
     the group numbers.

_U_s_a_g_e:

     prop.trend.test(x, n, score = 1:length(x))

_A_r_g_u_m_e_n_t_s:

       x: Number of events 

       n: Number of trials 

   score: Group score 

_V_a_l_u_e:

     An object of class '"htest"' with title, test statistic, p-value,
     etc.

_N_o_t_e:

     This really should get integrated with 'prop.test'

_A_u_t_h_o_r(_s):

     Peter Dalgaard

_S_e_e _A_l_s_o:

     'prop.test'

_E_x_a_m_p_l_e_s:

     smokers  <- c( 83, 90, 129, 70 )
     patients <- c( 86, 93, 136, 82 )
     prop.test(smokers, patients)
     prop.trend.test(smokers, patients)
     prop.trend.test(smokers, patients,c(0,0,0,1))