| dropUnanimous {pscl} | R Documentation |
Drop unanimous votes from rollcall objects and rollcall matrices.
dropUnanimous(obj, lop = 0)
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. |
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.
A rollcall object or a matrix depending on
the class of object.
Simon Jackman jackman@stanford.edu
dropRollCall,
rollcall, summary.rollcall, ideal
data(s109) s109.working <- dropUnanimous(s109) summary(s109.working)