respiratory              package:HSAUR              R Documentation

_R_e_s_p_i_r_a_t_o_r_y _I_l_l_n_e_s_s _D_a_t_a

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

     The respiratory status of patients recruited for a randomised
     clinical multicenter trial.

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

     data("respiratory")

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

     A data frame with 555 observations on the following 7 variables.

     '_c_e_n_t_r_e' the study center, a factor with levels '1' and '2'.

     '_t_r_e_a_t_m_e_n_t' the treatment arm, a factor with levels 'placebo' and
          'treatment'.

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

     '_a_g_e' the age of the patient.

     '_s_t_a_t_u_s' the respiratory status (response variable),  a factor
          with levels 'poor' and 'good'.

     '_m_o_n_t_h' the month, each patient was examined at months  '0', '1',
          '2', '3' and '4'.

     '_s_u_b_j_e_c_t' the patient ID, a factor with levels '1' to '111'.

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

     In each of two centres, eligible patients were randomly assigned 
     to active treatment or placebo. During the treatment, the
     respiratory status (categorised 'poor' or 'good') was determined
     at each of four, monthly visits. The trial recruited 111
     participants (54 in the active group, 57 in the placebo group) and
     there were no missing data for either the responses or the
     covariates. The question of interest is to assess whether the
     treatment is effective and to estimate its effect.

     Note that the data are in long form, i.e, repeated measurments are
     stored as additional rows in the data frame.

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

     C. S. Davis (1991), Semi-parametric and non-parametric methods for
     the analysis of repeated measurements with applications to
     clinical trials. _Statistics in Medicine_, *10*,  1959-1980.

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

       data("respiratory", package = "HSAUR")
       mosaicplot(xtabs( ~ treatment + month + status, data = respiratory))

