minmaxctlcap: Set thinning and thickening caps for full matching

In optmatch: Functions for Optimal Matching

Set thinning and thickening caps for full matching

Description

Functions to find the largest value of min.controls, or the smallest value of max.controls, for which a full matching problem is feasible. These are determined by constraints embedded in the matching problem's distance matrix.

Usage

maxControlsCap(distance, min.controls = NULL, solver = "")

minControlsCap(distance, max.controls = NULL, solver = "")

Arguments

distance	Either a matrix of non-negative, numeric discrepancies, or a list of such matrices. (See fullmatch for details.)
min.controls	Optionally, set limits on the minimum number of controls per matched set. (Only makes sense for maxControlsCap.)
solver	Choose which solver to use. See help(fullmatch) for details.
max.controls	Optionally, set limits on the maximum number of controls per matched set. (Only makes sense for minControlsCap.)

Details

The function works by repeated application of full matching, so on large problems it can be time-consuming.

Value

For minControlsCap, strictest.feasible.min.controls and given.max.controls. For maxControlsCap, given.min.controls and strictest.feasible.max.controls.

strictest.feasible.min.controls	The largest values of the fullmatch argument min.controls that yield a full match;
given.max.controls	The max.controls argument given to minControlsCap or, if none was given, a vector of Infs.
given.min.controls	The min.controls argument given to maxControlsCap or, if none was given, a vector of 0s;
strictest.feasible.max.controls	The smallest values of the fullmatch argument max.controls that yield a full match.

Note

Essentially this is just a line search. I've done several things to speed it up, but not everything that might be done. At present, not very thoroughly tested either: you might check the final results to make sure that fullmatch works with the values of min.controls (or max.controls) suggested by these functions, and that it ceases to work if you increase (decrease) those values. Comments appreciated.

Author(s)

Ben B. Hansen

References

Hansen, B.B. and S. Olsen Klopfer (2006), ‘Optimal full matching and related designs via network flows’, Journal of Computational and Graphical Statistics 15, 609–627.

See Also

fullmatch

optmatch documentation built on Sept. 19, 2024, 9:06 a.m.