importance              package:labdsv              R Documentation

_I_m_p_o_r_t_a_n_c_e _T_a_b_l_e

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

     For a classified set of vegetation samples,  a importance table
     lists for a each species  the average abundance (ignoring zeros)
     of each species in each class.

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

     importance(taxa,clustering,minval,digits,spcord)

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

    taxa: a data.frame of species abundances with samples as rows and 
          species as columns

clustering: a vector of (integer) class memberships

  minval: the minimum importance a species must have in at least one
          class to be included in the output

  digits: the number of digits to report in the table

  spcord: a vector of integers to specify the order in which species 
          should be listed in the table

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

     a data.frame with species as rows, classes as columns, with 
     average abundance of species in classes.

_N_o_t_e:

     Importance tables are often used in vegetation classification to
     calculate or present characteristic species for specific classes
     or types. Importance may be combined with 'const' and  'vegtab' to
     achieve a vegetation table-oriented analysis

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

     David W. Roberts droberts@montana.edu <URL:
     http://ecology.msu.montana.edu/droberts>

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

     <URL: http://ecology.msu.montana.edu/labdsv/R>

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

     'const', 'vegtab'

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

         data(bryceveg) # returns a data.frame called bryceveg
         class <- sample(1:10,nrow(bryceveg),replace=TRUE)
         importance(bryceveg,class,minval=0.25)

