press                  package:DAAG                  R Documentation

_P_r_e_d_i_c_t_i_v_e _E_r_r_o_r _S_u_m _o_f _S_q_u_a_r_e_s

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

     Allen's PRESS statistic is computed for a fitted model.

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

     press(obj)

_A_r_g_u_m_e_n_t_s:

     obj: A 'lm' object 

_V_a_l_u_e:

     A single numeric value.

_A_u_t_h_o_r(_s):

     W.J. Braun

_S_e_e _A_l_s_o:

     'lm'

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

     litters.lm <- lm(brainwt ~ bodywt + lsize, data = litters)
     press(litters.lm)
     litters.lm0 <- lm(brainwt ~ bodywt + lsize -1, data=litters)
     press(litters.lm0) # no intercept
     litters.lm1 <- lm(brainwt ~ bodywt, data=litters)
     press(litters.lm1) # bodywt only
     litters.lm2 <- lm(brainwt ~ bodywt + lsize + lsize:bodywt, data=litters)
     press(litters.lm2) # include an interaction term

