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)