caliperSize: (Internal) Determines how many other units fall within a...

View source: R/feasible.R

caliperSizeR Documentation

(Internal) Determines how many other units fall within a caliper distance


The matching functions fullmatch and pairmatch have a maximum problem size, based on the number of comparisons between treated and control units. For a completely dense problem, in which every treated units is compared to every control unit there are length(treated) * length(control) comparisons. A caliper restricts which comparisons are valid, disallowing matches of treated and control pairs that are too far apart. A caliper can significantly decrease the size of a matching problem. The caliperSize function reports exactly who many valid treated-control comparisons remain after applying a caliper of the given width.


caliperSize(scores, z, width, structure = NULL)



A numeric vector of scores providing 1-D position of units


Treatment indicator vector


Width of caliper, must be positive


Grouping factor to use in computation


numeric Total number of pairwise distances remaining after the caliper is placed.

optmatch documentation built on Aug. 15, 2022, 9:07 a.m.