match.data               package:Zelig               R Documentation

_O_u_t_p_u_t _m_a_t_c_h_e_d _d_a_t_a _s_e_t_s

_D_e_s_c_r_i_p_t_i_o_n:

     The code 'match.data' creates output data sets from the 'matchit'
     matching algorithm.

_U_s_a_g_e:

     match.data <- match.data(object, group = "all")

_A_r_g_u_m_e_n_t_s:

  object: Stored output from 'matchit'.

   group: Which units to output.  Selecting "all" (default) gives all
          matched units (treated and control), "treat" gives just the
          matched treated units, and "control" gives just the matched
          control units.

_V_a_l_u_e:

     The 'match.data' command generates a matched data set from the
     output of the 'matchit' function, according to the options
     selected in the 'group' argument.  The matched data set contains
     the additional variables:  

  pscore: The propensity score for each unit.

 psclass: The subclass index for each unit (if applicable).

psweights: The weight for each unit (generated from the matching
          procedure).

     See the 'matchit' documentation for more details on these items.

_A_u_t_h_o_r(_s):

     Daniel Ho <deho@fas.harvard.edu>; Kosuke Imai
     <kimai@princeton.edu>; Gary King <king@harvard.edu>; Elizabeth
     Stuart<stuart@stat.harvard.edu>

_S_e_e _A_l_s_o:

     The complete documentation for 'matchit' is available online at
     <URL: http://gking.harvard.edu/matchit>.

