dropUnanimous              package:pscl              R Documentation

_d_r_o_p _u_n_a_n_i_m_o_u_s _v_o_t_e_s _f_r_o_m _r_o_l_l_c_a_l_l _o_b_j_e_c_t_s _a_n_d _m_a_t_r_i_c_e_s

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

     Drop unanimous votes from rollcall objects and rollcall matrices.

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

     dropUnanimous(obj, lop = 0)

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

     obj: object, either of class 'rollcall' or 'matrix'

     lop: numeric, non-negative integer, less than number of
          legislators represented in 'obj'.  Roll calls with 'lop' or
          fewer legislators voting in the minority are dropped. 
          Default is 0, meaning that unanimous votes are dropped.

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

     Unanimous votes are the equivalent of test items that all subjects
     score "correct" (or all subjects scores "incorrect"); since there
     is no variation among the legislators/subjects, these votes/items
     provide no information as to latent traits (ideology, preferences,
     ability).  A reasonably large number of rollcalls in any
     contemporary U.S. Congress are unanimous.

     Specific methods are provided for objects of class 'rollcall' or
     'matrix'.

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

     A 'rollcall' object or a 'matrix' depending on the class of
     'object'.

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

     Simon Jackman jackman@stanford.edu

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

     'dropRollCall', 'rollcall', 'summary.rollcall', 'ideal'

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

     data(s109)
     s109.working <- dropUnanimous(s109)
     summary(s109.working)

