trees                  package:base                  R Documentation

_G_i_r_t_h, _H_e_i_g_h_t _a_n_d _V_o_l_u_m_e _f_o_r _B_l_a_c_k _C_h_e_r_r_y _T_r_e_e_s

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

     This data set provides measurements of the girth, height and
     volume of timber in 31 felled black cherry trees.  Note that girth
     is the diameter of the tree (in inches) measured at 4 ft 6 in
     above the ground.

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

     data(trees)

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

     Ryan, T. A., Joiner, B. L. and Ryan, B. F. (1976) The Minitab
     Student Handbook. Duxbury Press.

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

     Atkinson, A. C. (1985)  Plots, Transformations and Regression.
     Oxford University Press.

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

     data(trees)
     pairs(trees, panel = panel.smooth, main = "trees data")
     plot(Volume ~ Girth, data = trees, log = "xy")
     coplot(log(Volume) ~ log(Girth) | Height, data = trees,
            panel = panel.smooth)
     summary(fm1 <- lm(log(Volume) ~ log(Girth), data = trees))

