pchisqnc               package:hpower               R Documentation

_N_o_n_c_e_n_t_r_a_l _C_h_i-_s_q_u_a_r_e _D_i_s_t_r_i_b_u_t_i_o_n

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

     Using the first terms in the series expansion 26.4.25 in
     Abramowitz and Stegun, compute the probability integral of the
     noncentral chi-square distribution.

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

     pchisqnc(q, df, lm, iprec=c(6))

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

       q: vector of quantiles. 

      df: vector of degrees of freedom. 

      lm: vector of noncentrality parameters. 

   iprec: a parameter governing the precision of the answer; higher
          values lead to greater precision. The default is iprec=6. For
          large lm, the true answer will exceed the returned value by
          no more than 1-pnorm(iprec). 

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

     probability that a noncentral chi-square variable with degrees of
     freedom df and noncentrality parameter lm is less than q.

_N_O_T_E:

     Let n be the length of the longest of q, df and lm. If any of q,
     df and lm is of length less than n, then all values after the
     first in that vector are ignored. Only the first element of iprec
     is used.

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

     Daniel F. Heitjan <dheitjan@peter.cpmc.columbia.edu>,   R-port by
     Stefan Funke <funke@attglobal.net>

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

     Milton Abramowitz and Irene A. Stegun, Handbook of Mathematical
     Functions, p. 942, Dover, 1970.

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

     `pfnc' , `pchisq'

