cemspace {cem}R Documentation

Exploration tool for CEM

Description

Exploration tool for CEM

Usage

cemspace(treatment=NULL, data = NULL, R=100, grouping = NULL, drop=NULL,
L1.breaks = NULL, plot = TRUE, fixed = NULL, minimal = 1, maximal = 5,
M=250, raw.profile=NULL) 

Arguments

treatment character, name of the treatment variable.
data a data.frame.
R number of possible random coarsening for the CEM.
grouping named list, each element of which is a list of groupings for a single categorical variable. For more details see cem.
drop a vector of variable names in the data frame to ignore during matching
L1.breaks list of cutpoints for the calculation of the L1 measure.
plot plot the space of solutions?
fixed vector of variable names which will not be relaxed.
minimal the minimal number of intervals acceptable after relaxation. Should be a nameed list of positive integers or if a number, this is applied to all variables.
maximal the maximal number of intervals acceptable after relaxation. Should be a nameed list of positive integers or if a number, this is applied to all variables.
M number of possible random coarsening for the L1 measure
raw.profile and object of class L1profile. If passed, the L1.breaks are ignored.

Details

This is a tool to help the user to explore different cem solutions by choosing random coarsenings. The algorithm tries R random choiches of coarsenings into intervals between minimal and maximal for numerical, integer or ordered factors. It drops or include dichotomous or boolean variables.

Calling directly plot on the output of cemspace has the same effect of calling directly imbspace.plot.

If you want to relax a given cem solution, use the function imbspace instead.

Value

val an invisible object of class imbalance.space.

Author(s)

Stefano Iacus, Gary King, and Giuseppe Porro

References

Stefano Iacus, Gary King, Giuseppe Porro, ``Matching for Casual Inference Without Balance Checking: Coarsened Exact Matching,'' http://gking.harvard.edu/files/abs/cem-abs.shtml

See Also

imbspace.plot, cemspace

Examples

## Not run: 
data(LL)
tmp <- cemspace("treated", LL, drop="re78", M=50)
## End(Not run)

[Package cem version 1.0.142 Index]