visual               package:Fahrmeir               R Documentation

_V_i_s_u_a_l _I_m_p_a_i_r_m_e_n_t _D_a_t_a

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

     For 5199 individuals bivariate binary responses were observed,
     indicating  wheater or not an eye was visually impaired, with
     covariates. The main  objective is to analyze the influence of age
     and race on visual impairment,  controlling for education, a
     surrogate for socioeconomic status. Data are only  given
     individually for right and left eye, the bivariate response is
     lost.

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

     data(visual)

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

     The format is: List of 2 $ left :`data.frame':  16 obs. of  4
     variables: ..$ left: Factor w/ 2 levels "no","yes": 2 1 2 1 2 1 2
     1 2 1 ... ..$ race: Factor w/ 2 levels "black","white": 2 2 2 2 2
     2 2 2 1 1 ... ..$ age : Factor w/ 4 levels "40-50","51-60",..: 1 1
     2 2 3 3 4 4 1 1 ... ..$ n   : int [1:16] 15 617 24 557 42 789 139
     673 29 750 ... $ right:`data.frame':  16 obs. of  4 variables: ..$
     right: Factor w/ 2 levels "no","yes": 2 1 2 1 2 1 2 1 2 1 ... ..$
     race : Factor w/ 2 levels "black","white": 2 2 2 2 2 2 2 2 1 1 ...
     ..$ age  : Factor w/ 4 levels "40-50","51-60",..: 1 1 2 2 3 3 4 4
     1 1 ... ..$ n    : int [1:16] 19 613 25 556 48 783 146 666 31 748
     ...

_D_e_t_a_i_l_s:

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

     Ludwig Fahrmeir, Gerhard Tutz (1994):  Multivariate Statistical
     Modelling Based on Generalized Linear Models. Springer Series in
     Statistics.  Springer Verlag. New-York  Berlin Heidelberg

_R_e_f_e_r_e_n_c_e_s:

_E_x_a_m_p_l_e_s:

     str(visual) 
     summary(visual)

