lizards                 package:aod                 R Documentation

_A _C_o_m_p_a_r_i_s_o_n _o_f _S_i_t_e _P_r_e_f_e_r_e_n_c_e_s _o_f _T_w_o _S_p_e_c_i_e_s _o_f _L_i_z_a_r_d

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

     "These data describe the daytime habits of two species of lizards,
     _grahami_ and _opalinus_.  They were collected by observing
     occupied sites or perches and recording the appropriate
     description, namely  species involved, time of the day, height and
     diameter of the perch and whether the site was sunny or shaded. 
     Time of the day is recorded as early, mid-day or late." (McCullagh
     and Nelder, 1989, p.129).

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

     data(lizards)

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

     A data frame with 24 observations on the following 6 variables.

     _S_i_t_e A factor with levels 'Sun' and 'Shade'.

     _D_i_a_m_e_t_e_r A factor with levels 'D <= 2' and 'D > 2' (inches). 

     _H_e_i_g_h_t A factor with levels 'H < 5' and 'H >= 5' (feet).

     _T_i_m_e A factor with levels 'Early', 'Mid-day' and 'Late'.

     _g_r_a_h_a_m_i A numeric vector giving the observed sample size for
          _grahami_ lizards.

     _o_p_a_l_i_n_u_s A numeric vector giving the observed sample size for
          _opalinus_ lizards.

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

     The data were originally published in Fienberg (1970).

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

     McCullagh, P., Nelder, J.A., 1989. _Generalized linear models_.
     London, Chapman & Hall, 511 p.

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

     Fienberg, S.E., 1970. _The analysis of multidimensional
     contingency tables_. Ecology 51: 419-433.

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

     data(lizards)

