DiagnosticProb         package:compositions         R Documentation

_D_i_a_g_n_o_s_t_i_c _p_r_o_b_a_b_i_l_i_t_i_e_s

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

     Data record the probabilities assigned by subjective diagnostic of
     15 clinicians and 15 statisticians.

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

     data(DiagnosticProb)

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

     The data consist of 30 cases: 15 diagnostics probabilities
     assigned by clinicians, 15 diagnostics probabilities assigned by
     statisticians, and 4 variables: probabilities A, B, and C, and
     type i.e. 1 for clinicians,  2 for statisticians.

     In the study of subjective performance in inferential task the
     subject is faced with the finite set of mutually exclusive and
     exhaustive hypothesis,  and the basis of specific information
     presented to him/her is required to divide the available unit of
     probability among these probabilities. In this study the task is
     presented as a problem of differential diagnosis of three mutually
     exclusive and exhaustive diseases of students, known under the
     generic title of 'newmath syndrome',

         A  - algebritis,
         B  - bilateral paralexia,
         C  - calculus deficiency.

     The subject, playing the role of diagnostician, is informed that
     the three diseases types are equally common and is shown the
     results of 10 diagnostic tests on 60 previous cases of known
     diagnosis, 20 of each type. The subject is then shown the results
     of the 10 tests for a new undiagnosed cases and asked to assign
     diagnostic probabilities to the three possible disease types.

     Data record the subjective assessments of 15 clinicians and 15
     statisticians for the same case. For this case the objective
     diagnosis probabilities are known to be $(.08, .05, .87).$

     All row probabilities sum to 1, except for some rounding errors.

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

     Aitchison: CODA microcomputer statistical package, 1986, the file
     name DIAGPROB.DAT, here included under the GNU Public Library
     Licence Version 2 or newer.

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

     Aitchison: The Statistical Analysis of Compositional Data, 1986,
     Data 17, pp20.

