ArcticLake           package:compositions           R Documentation

_A_r_t_i_c _l_a_k_e _s_e_d_i_m_e_n_t _s_a_m_p_l_e_s _o_f _d_i_f_f_e_r_e_n_t _w_a_t_e_r _d_e_p_t_h

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

     Sand, silt and clay compositions of 39 sediment samples of
     different water depth in an Arctic lake.

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

     data(ArcticLake)

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

     Sand, silt and clay compositions of 39 sediment samples at
     different water depth (in meters) in an Arctic lake. The
     additional feature is a concomitant variable or {\em covariate,\/}
     water depth, which may account for some of the variation in the
     compositions. In statistical terminology we have a multivariate
     regression problem with sediment composition  as regressand and
     water depth as regressor.

     All row percentage sums to 100, except for rounding errors.

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

     Aitchison: CODA microcomputer statistical package, 1986, the file
     name ARCTIC.DAT, here included under the GNU Public Library
     Licence Version 2 or newer.

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

     Aitchison: The Statistical Analysis of Compositional Data, 1986,
     Data 5, pp5.

