phosphor             package:robustbase             R Documentation

_P_h_o_s_p_h_o_r_u_s _C_o_n_t_e_n_t _D_a_t_a

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

     This dataset investigates the effect from inorganic and organic
     Phosphorus in the soil upon the phosphorus content of the corn
     grown in this soil, from Prescott (1975).

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

     data(phosphor)

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

     A data frame with 18 observations on the following 3 variables.

     '_i_n_o_r_g' Inorganic soil Phosphorus

     '_o_r_g_a_n_i_c' Organic soil Phosphorus

     '_p_l_a_n_t' Plant Phosphorus content

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

     P. J. Rousseeuw and A. M. Leroy (1987) _Robust Regression and
     Outlier Detection._ Wiley, p.156, table 24.

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

     data(phosphor)
     plot(phosphor)
     summary(lm.phosphor <- lm(plant ~ ., data = phosphor))
     summary(lts.phosphor <- ltsReg(plant ~ ., data = phosphor))

     phosphor.x <- data.matrix(phosphor[, 1:2])
     cPh <- covMcd(phosphor.x)
     plot(cPh, "dd")

