Sitka89                 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_9

_D_e_s_c_r_i_p_t_i_o_n:

     The 'Sitka89' data frame has 632 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 eight times in 1989, at roughly
     monthly intervals.

_U_s_a_g_e:

     Sitka89

_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

_S_e_e _A_l_s_o:

     'Sitka'

