eyegrade               package:faraway               R Documentation

_g_r_a_d_i_n_g _o_f _e_y_e _p_a_i_r_s _f_o_r _d_i_s_t_a_n_c_e _v_i_s_i_o_n

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

     A sample of women are rated for the performance of distance vision
     in each eye.

_U_s_a_g_e:

     data(eyegrade)

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

     A data frame with 16 observations on the following 3 variables.

     _y the observed count

     _r_i_g_h_t rated vision in the right eye - a factor with levels 'best'
          'second' 'third' 'worst'

     _l_e_f_t rated vision in the left eye - a factor with levels 'best'
          'second' 'third' 'worst'

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

     A. Stuart (1955) A test for homogeneity of the marginal
     distributions in a two-way classification, Biometrika, 42,
     412-416.

