## febrl-list — General discussion and help list for Febrl

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 [Febrl-list] EM algorithm + some other questions From: Albert-jan Roskam - 2008-02-21 10:13:56 ```Hi Febrl community, --Has the EM algorithm already been implemented in Febrl 0.4? I saw a remark about it in the manual of Febrl 0.3 (to do list), but I can't find information about it in 0.4. I am looking for what is generally accepted to be the best method for estimating the M and U probabilities. --I have one question about a linkage job I started working on. File A contains municipal register data, to be linked with File B which contains perinatal data. We would like to link using the fields dob_mother, dob_child, postcode4digit, gender_child. File A has multiple records per mother (each with a validity date), for instance because of address changes. I would like to determine which record matches best with the B data. Assumption would be that, when distance D between dob_child and validity_date is closest to zero, the probability of a correct match is highest. But we want to take a margin of, say, 200 days around dob_child and use the remaining records, *and* distance measure D in the linkage process. In dataset B, D = 0 for all records. I hope I explained this correctly, but may question is: what comparison algoritm can best be used for this? Numeric comparison with absolute tolerance? --I am currently using v0.3 (it takes a dreadfully long time before my department approves new software, ie. setups needed for the GUI --apologies to the Febrl developer!). But can I just use project_linkage.py and use it in 0.4 once I have it? Thanks in advance for your replies! Cheers!! Albert-Jan ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ ```

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