conc                  package:ineq                  R Documentation

_C_o_n_c_e_n_t_r_a_t_i_o_n _M_e_a_s_u_r_e_s

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

     computes the concentration within a vector according to the
     specified concentration measure

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

     conc(x, parameter = NULL, type = c("Herfindahl", "Rosenbluth"))

     Herfindahl(x, parameter = 1)
     Rosenbluth(x)

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

       x: a vector containing non-negative elements

parameter: parameter of the concentration measure (if set to 'NULL' the
          default parameter of the respective measure is used)

    type: character string giving the measure used to compute
          concentration. must be one of the strings in the default
          argument (the first character is sufficient). defaults to
          "Herfindahl".

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

     'conc' is just a wrapper for the concentration measures of
     'Herfindahl' and 'Rosenbluth' (Hall / Tiedemann / Rosenbluth). If
     parameter is set to 'NULL' the default from the respective
     function is used.

_V_a_l_u_e:

     the value of the concentration measure

_A_u_t_h_o_r(_s):

     Achim Zeileis zeileis@ci.tuwien.ac.at

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

     F A Cowell: Measurement of Inequality, 2000, in A B Atkinson / F
     Bourguignon (Eds): Handbook of Income Distribution, Amsterdam,

     F A Cowell: Measuring Inequality, 1995 Prentice Hall/Harvester
     Wheatshef,

     M Hall / N Tidemann: Measures of Concentration, 1967, JASA 62,
     162-168.

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

     'ineq', 'pov'

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

     # generate vector (of sales)
     x <- c(541, 1463, 2445, 3438, 4437, 5401, 6392, 8304, 11904, 22261)
     # compute Herfindahl coefficient with parameter 1
     conc(x)
     # compute coefficient of Hall/Tiedemann/Rosenbluth
     conc(x, type="Rosenbluth")

