fastLink (version 0.6.1)

stringSubset: stringSubset

Description

Removes as candidate matches any observations with no close matches on string-distance measures.

Usage

stringSubset(vecA, vecB, similarity.threshold, stringdist.method,
jw.weight, n.cores)

Value

A list of length two, where the both entries are a vector of indices to be included in the match from dataset A (entry 1) and dataset B (entry 2).

Arguments

vecA

A character or factor vector from dataset A

vecB

A character or factor vector from dataset B

similarity.threshold

Lower bound on string-distance measure for being considered a possible match. If an observation has no possible matches above this threshold, it is discarded from the match. Default is 0.8.

stringdist.method

The method to use for calculating string-distance similarity. Possible values are 'jaro' (Jaro Distance), 'jw' (Jaro-Winkler), and 'lv' (Levenshtein). Default is 'jw'.

jw.weight

Parameter that describes the importance of the first characters of a string (only needed if stringdist.method = "jw"). Default is .10.

n.cores

Number of cores to parallelize over. Default is NULL.

Examples

if (FALSE) {
subset_out <- stringSubset(dfA$firstname, dfB$lastname, n.cores = 1)
fl_out <- fastLink(dfA[subset_out$dfA.block == 1,], dfB[subset_out$dfB.block == 1,],
varnames = c("firstname", "lastname", "streetname", "birthyear"), n.cores = 1)
}