

aids(boot)                                   R Documentation

_D_e_l_a_y _i_n _A_I_D_S _R_e_p_o_r_t_i_n_g _i_n _E_n_g_l_a_n_d _a_n_d _W_a_l_e_s

_A_r_g_u_m_e_n_t_s_:

    year: The year of the diagnosis.

 quarter: The quarter of the year in which diagnosis was
          made.

   delay: The time delay (in months) between diagnosis and
          reporting. 0 means that the case was reported
          within one month.  Longer delays are grouped in 3
          month intervals and the value of `delay' is the
          midpoint of the interval (therefore a value of `2'
          indicates that reporting was delayed for between 1
          and 3 months).

     dud: An indicator of censoring. These are categories
          for which full information is not yet available
          and the number recorded is a lower bound only.

    time: The time interval of the diagnosis. That is the
          number of quarters from July 1983 until the end of
          the quarter in which these cases were diagnosed.

       y: The number of AIDS cases reported.

_S_U_M_M_A_R_Y_:

     The `aids' data frame has 570 rows and 6 columns.

     Although all cases of AIDS in England and Wales must be
     reported to the Communicable Disease Surveillance Cen-
     tre, there is often a considerable delay between the
     time of diagnosis and the time that it is reported.  In
     estimating the prevalence of AIDS, account must be
     taken of the unknown number of cases which have been
     diagnosed but not reported.  The data set here records
     the reported cases of AIDS diagnosed from July 1983 and
     until the end of 1992.  The data are cross-classified
     by the date of diagnosis and the time delay in the
     reporting of the cases.

_D_A_T_A _D_E_S_C_R_I_P_T_I_O_N_:

     This data frame contains the following columns:

_S_O_U_R_C_E_:

     The data were obtained from

     De Angelis, D. and Gilks, W.R. (1994) Estimating
     acquired immune deficiency syndrome accounting for
     reporting delay.  Journal of the Royal Statistical
     Society, A, 157, 31-40.

_O_T_H_E_R _R_E_F_E_R_E_N_C_E_S_:

     Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Meth-
     ods and Their Application.  Cambridge University Press.

