marijuana                package:drm                R Documentation

_L_o_n_g_i_t_u_d_i_n_a_l _d_a_t_a _s_e_t _o_n _t_e_e_n_a_g_e _m_a_r_i_j_u_a_n_a _u_s_e

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

     This data set is from US National Youth Survey reporting a
     repeated questionnaire on marijuana use of 237 teenagers yearly
     from ages 13 to 17 on an ordinal scale.

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

     data(marijuana)

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

     This data frame contains the following columns:

     _i_d identification number of a teenager.

     _y marijuana response, 1: never; 2: less than once a month; 3: more
          than once a month.

     _s_e_x a factor with levels 'female'  'male' 

     _a_g_e age as a factor with levels '13'  '14'  '15'  '16'  '17' 


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

     Lang, JB, McDonald, JW, Smith, PWF. (1999). Association marginal
     modelling of multivariate categorical responses: A maximum
     likelihood approach. _JASA_, 94, 1161-1171.

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

     Jokinen J, McDonald JW, Smith PWF. Meaningful regression and
     association models for clustered ordinal data. _Sociological
     Methodology_ 2006; 36:173-199.

