disc                  package:ade4                  R Documentation

_R_a_o'_s _d_i_s_s_i_m_i_l_a_r_i_t_y _c_o_e_f_f_i_c_i_e_n_t

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

     Calculates the root square of Rao's dissimilarity coefficient
     between samples.

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

     disc(samples, dis = NULL, structures = NULL)

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

 samples: a data frame with elements as rows, samples as columns, and
          abundance, presence-absence or frequencies as entries

     dis: an object of class 'dist' containing distances or
          dissimilarities among elements. If 'dis' is NULL,
          equidistances are used.

structures: a data frame containing, in the jth row and the kth column,
          the name of the group of level k to which the jth population
          belongs.

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

     Returns a list of objects of class 'dist'

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

     Sandrine Pavoine pavoine@biomserv.univ-lyon1.fr

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

     Rao, C.R. (1982) Diversity and dissimilarity coefficients: a
     unified approach. _Theoretical Population Biology_, *21*, 24-43.

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

     data(humDNAm)
     humDNA.dist <- disc(humDNAm$samples, sqrt(humDNAm$distances), humDNAm$structures)
     humDNA.dist
     is.euclid(humDNA.dist$samples)
     is.euclid(humDNA.dist$regions)

     ## Not run: 
     data(ecomor)
     ecomor.phylog <- taxo2phylog(ecomor$taxo)
     ecomor.dist <- disc(ecomor$habitat, ecomor.phylog$Wdist)
     ecomor.dist
     is.euclid(ecomor.dist)
     ## End(Not run)

