cass2                package:twostage                R Documentation

_T_h_e _C_A_S_S _p_i_l_o_t _d_a_t_a_s_e_t _w_i_t_h _s_e_x _a_n_d _c_a_t_e_g_o_r_i_c_a_l _w_e_i_g_h_t 
_a_s _a_u_x_i_l_i_a_r_y _v_a_r_i_a_b_l_e_s

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

     This is a pilot dataset from the Coronary Artery Surgery Study
     (CASS) 
 register (Reilly, 1996). It consists of a random sample
     of 10
 observations from each of the strata defined by different
     levels
 of mortality, sex and weight category. The "first-stage"
     data from
 which this pilot sample was chosen had 8096
     observations. There are 
 ten variables in the pilot dataset (see
     FORMAT).

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

     The dataset has 118 observations with 10 variables arranged in the
      following columns: 


     Column 1 (Mortality) 
     The operative mortality of the patients 
     (0 = Alive, 1 = Dead) 


     Column 2 (sex) 
     (0 = Male, 1 = Female) 


     Column 3 (Categorical Weight) 
     1 = weight less than 60 kg 
     2 = weight between 60-70 kg 
     3 = weight 70 kg or more 


     Column 4 (weight) 
     The actual weight (in Kg) of the patients at the time of bypass
     surgery 


     Column 5 (age) 
     Age of patients at the time of bypass surgery 


     Column 6 (Unstable angina) 
     The angina status of the patients at the time of bypass surgery 
     (0 = Stable, 1 = Unstable) 


     Column 7 (Congestive Heart Failure Score (CHF) score) 


     Column 8 (Left ventricular end diastolic blood pressure (LVEDBP)) 


     Column 9 (Urgency of Surgery) 
     (0 = Not urgent, 1 = Urgent) 


     Column 10 (the auxiliary variables, Z) 
     Different values describe the different levels of sex and weight 
     category 


     1 = Male; weight less than 60 kg 
     2 = Male; weight between 60-70 kg 
     3 = Male; weight 70 kg or more
     4 = Female; weight less than 60 kg 
     5 = Female; weight between 60-70 kg 
     6 = Female; weight 70 kg or more

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

     Vliestra, et.al. (1980)

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

     Reilly,M. 1996. Optimal sampling strategies for two-stage studies.
     
 Amer. J. Epidemiol. 143:92-100

     Vliestra,R.E.,Frye R.L., Kromnal R.A.,et.al.(1980). Risk factors
     and angiographic
 coronary artery disease: a report from the
     Coronary Artery Surgery Study (CASS).
 Circulation 62:254-61

_S_e_e _A_l_s_o:

     `msnprev',`fixed.n',
 `budget',`precision',
     `cass1',`cass2',`coding'

