jaccard               package:prabclus               R Documentation

_J_a_c_c_a_r_d _d_i_s_t_a_n_c_e _m_a_t_r_i_x

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

     Computes Jaccard distances between the columns of a 0-1-matrix.

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

     jaccard(regmat)

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

  regmat: 0-1-matrix. Columns are species, rows are regions.

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

     The Jaccard distance between two species is 1-(number of regions
     where both species are present)/(number of regions where at least
     one species is present).

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

     A symmetrical matrix of Jaccard distances.

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

     Christian Hennig hennig@math.uni-hamburg.de <URL:
     http://www.math.uni-hamburg.de/home/hennig/>

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

     'kulczynski'

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

     data(kykladspecreg)
     # Note: If you do not use the installed package, replace this by
     # kykladspecreg <- read.table("(path/)kykladspecreg.dat")
     jaccard(t(kykladspecreg))

