Pi               package:approximator               R Documentation

_K_e_n_n_e_d_y'_s _P_i _n_o_t_a_t_i_o_n

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

     Evaluates Kennedy's Pi product

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

     Pi(hpa, i, j)

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

     hpa: Hyperparameter object

       i: subscript

       j: superscript

_D_e_t_a_i_l_s:

     This function evaluates Kennedy's Pi product, but with the
     additional feature that Pi_i^j=0 if i>j+1. This seems to work in
     practice.

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

     Robin K. S. Hankin

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

     M. C. Kennedy and A. O'Hagan 2000. "Predicting the output from a
     complex computer code when fast approximations are available"
     Biometrika, 87(1): pp1-13

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

     data(toyapps)
     Pi(hpa.toy,1,2)
     Pi(hpa.toy,2,2)
     Pi(hpa.toy,3,2)
     Pi(hpa.toy,4,2)

