

trees {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 at
     4 ft 6 in above the ground.

_U_s_a_g_e_:

     data(trees)

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

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

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

     A. C. Atkinson (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))

