MASS-internal package:MASS R Documentation _I_n_t_e_r_n_a_l _M_A_S_S _f_u_n_c_t_i_o_n_s _D_e_s_c_r_i_p_t_i_o_n: Internal MASS functions. _U_s_a_g_e: enlist(vec) fbeta(x, alpha, beta) frequency.polygon(x, nclass = nclass.freq(x), xlab="", ylab="", ...) nclass.freq(x) neg.bin(theta = stop("'theta' must be given")) negexp.SSival(mCall, data, LHS) _D_e_t_a_i_l_s: These are not intended to be called by the user. Some are for compatibility with earlier versions of MASS (the book).