roller                 package:DAAG                 R Documentation

_L_a_w_n _R_o_l_l_e_r _D_a_t_a

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

     The 'roller' data frame has 10 rows and 2 columns. Different
     weights of roller were rolled over different parts of a lawn, and
     the depression was recorded.

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

     roller

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

     This data frame contains the following columns:

     _w_e_i_g_h_t a numeric vector consisting of the roller weights

     _d_e_p_r_e_s_s_i_o_n the depth of the depression made in the grass under the
          roller

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

     Stewart, K.M., Van Toor, R.F., Crosbie, S.F. 1988. Control of
     grass grub (Coleoptera: Scarabaeidae) with rollers of different
     design. N.Z. Journal of Experimental Agriculture 16: 141-150.

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

     plot(roller)
     roller.lm <- lm(depression ~ weight, data = roller)
     plot(roller.lm, which = 4)

