psychiatric            package:DPpackage            R Documentation

_P_s_y_c_h_i_a_t_r_i_c _C_l_i_n_i_c_a_l _T_r_i_a_l

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

     This data set consider information from a pychiatric clinical
     trial, reported by Hedeker and Gibbons (1994) and collected in the
     NIMH  Schizophrenia Collaborative Study on treatment-related
     changes in overall severity. For each patient, the Impatient
     Multidimensional Psychiatric Scale was scored. In this study, 437
     patients were randomly assigned to receive one of four
     medications: placebo, chlorpromazine, fluphenazine, or
     thioridazine.

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

     data(psychiatric)

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

     A data frame with 1603 observations on the following 5 variables.

     '_i_d' a numeric vector giving a unique identifier for the subject
          in the study

     '_i_m_p_s_7_9_o' a factor giving the Impatient Multidimensional
          Psuchiatric Scale scored as '1' = normal or borderline
          mentally ill, '2' = midly or moderately ill, '3' = markadely
          ill, and '4' = severely or among the the most extremely ill

     '_t_x' a numeric vector giving the treatment group, 0=Placebo,
          1=Drug

     '_w_e_e_k' a numeric vector giving the week where the measurement
          ocurred

     '_s_w_e_e_k' a numeric vector giving the square root transformation of
          time

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

     Hedeker, D. and Gibbons, R.D. (1994) A random-effects ordinal
     regression model for multilevel data. Biometrics, 50: 933-944.

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

     Hedeker, D. and Gibbons, R.D. (1994) A random-effects ordinal
     regression model for multilevel data. Biometrics, 50: 933-944.

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

     data(psychiatric)
     ## maybe str(psychiatric) ; plot(psychiatric) ...

