eagles                 package:MASS                 R Documentation

_F_o_r_a_g_i_n_g _E_c_o_l_o_g_y _o_f _B_a_l_d _E_a_g_l_e_s

_D_e_s_c_r_i_p_t_i_o_n:

     Knight and Skagen collected during a field study on the foraging
     behaviour of wintering Bald Eagles in Washington State, USA data
     concerning 160 attempts by one (pirating) Bald Eagle to steal a
     chum salmon from another (feeding) Bald Eagle.

_U_s_a_g_e:

     eagles

_F_o_r_m_a_t:

     The 'eagles' data frame has 8 rows and 5 columns.

     '_y' Number of successful attempts.

     '_n' Total number of attempts.

     '_P' Size of pirating eagle ('L' = large, 'S' = small).

     '_A' Age of pirating eagle ('I' = immature, 'A' = adult).

     '_V' Size of victim eagle ('L' = large, 'S' = small).

_S_o_u_r_c_e:

     Knight, R. L. and Skagen, S. K. (1988) Agonistic asymmetries and
     the foraging ecology of Bald Eagles. _Ecology_ *69*, 1188-1194.

_R_e_f_e_r_e_n_c_e_s:

     Venables, W. N. and Ripley, B. D. (1999) _Modern Applied
     Statistics with S-PLUS._ Third Edition. Springer.

_E_x_a_m_p_l_e_s:

     eagles.glm <- glm(cbind(y, n - y) ~ P*A + V, data = eagles,
                       family = binomial)
     dropterm(eagles.glm)
     prof <- profile(eagles.glm)
     plot(prof)
     pairs(prof)

