ichtyo                 package:ade4                 R Documentation

_P_o_i_n_t _s_a_m_p_l_i_n_g _o_f _f_i_s_h _c_o_m_m_u_n_i_t_y

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

     This data set gives informations between a faunistic array,  the
     total number of sampling points made at each sampling occasion and
      the year of the sampling occasion.

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

     data(ichtyo)

_F_o_r_m_a_t:

     'ichtyo' is a list of 3 components.

     _t_a_b is a faunistic array with 9 columns and 32 rows.

     _e_f_f is a vector of the 32 sampling effort.

     _d_a_t is a factor where the levels are the 10 years of the sampling
          occasion.

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

     The value n(i,j) at the ith row and the jth column in 'tab'
     corresponds to the number of sampling points of the ith sampling
     occasion (in 'eff') that contains the jth species.

_S_o_u_r_c_e:

     Doldec, S., Chessel, D. and Olivier, J. M. (1995) L'analyse des
     correspondances dcentre: application aux peuplements
     ichtyologiques du haut-Rhne. _Bulletin Franais de la Pche et de
     la Pisciculture_, *336*, 29-40.

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

     data(ichtyo)
     dudi1 <- dudi.dec(ichtyo$tab, ichtyo$eff, scan = FALSE)
     s.class(dudi1$li, ichtyo$dat, wt = ichtyo$eff / sum(ichtyo$eff))

