Sitka                  package:MASS                  R Documentation

_G_r_o_w_t_h _C_u_r_v_e_s _f_o_r _S_i_t_k_a _S_p_r_u_c_e _T_r_e_e_s _i_n _1_9_8_8

_D_e_s_c_r_i_p_t_i_o_n:

     The 'Sitka' data frame has 395 rows and 4 columns.  It gives
     repeated measurements on the log-size of 79 Sitka spruce trees, 54
     of which were grown in ozone-enriched chambers and 25 were
     controls.  The size was measured five times in 1988, at roughly
     monthly intervals.

_U_s_a_g_e:

     Sitka

_F_o_r_m_a_t:

     This data frame contains the following columns:

     '_s_i_z_e' measured size (height times diameter squared) of tree, on
          log scale

     '_T_i_m_e' time of measurement in  days since 1 January 1988

     '_t_r_e_e' number of tree

     '_t_r_e_a_t' either '"ozone"' for an ozone-enriched chamber or
          '"control"'

_S_o_u_r_c_e:

     P. J. Diggle, K.-Y. Liang and S. L. Zeger (1994) _Analysis of
     Longitudinal Data._ Clarendon Press, Oxford

_R_e_f_e_r_e_n_c_e_s:

     Venables, W. N. and Ripley, B. D. (2002) _Modern Applied
     Statistics with S._ Fourth edition.  Springer.

_S_e_e _A_l_s_o:

     'Sitka89'

