problink_em: Calculate EM-estimates of m- and u-probabilities
In reclin: Record Linkage Toolkit

Description Usage Arguments Value References Examples

Calculate EM-estimates of m- and u-probabilities

problink_em(
  patterns,
  mprobs0 = list(0.95),
  uprobs0 = list(0.02),
  p0 = 0.05,
  tol = 1e-05
)

`patterns`	either a table of patterns (as output by `tabulate_patterns`) or pairs with comparison columns (as output by `compare_pairs`).
`mprobs0, uprobs0`	initial values of the m- and u-probabilities. These should be lists with numeric values. The names of the elements in the list should correspond to the names in `by_x` in `compare_pairs`.
`p0`	the initial estimate of the probability that a pair is a match.
`tol`	when the change in the m and u-probabilities is smaller than `tol` the algorithm is stopped.

Returns an object of type problink_em. This is a list containing the estimated mprobs, uprobs and overall linkage probability p. It also contains the table of comparison patterns.

Fellegi, I. and A. Sunter (1969). "A Theory for Record Linkage", Journal of the American Statistical Association. 64 (328): pp. 1183-1210. doi:10.2307/2286061.

Herzog, T.N., F.J. Scheuren and W.E. Winkler (2007). Data Quality and Record Linkage Techniques, Springer.

data("linkexample1", "linkexample2")
pairs <- pair_blocking(linkexample1, linkexample2, "postcode")
pairs <- compare_pairs(pairs, c("lastname", "firstname", "address", "sex"))
model <- problink_em(pairs)
summary(model)