[Forum SIS] avviso di seminario 23 febbraio 2017 Roma Sapienza

[Brunero Liseo]

Avviso di Seminario

Il giorno 23 febbraio 2017 alle ore 12.30
presso l'auletta di matematica del primo piano della
facoltà di Economia, Sapienza Università di Roma
Via del Castro Laurenziano 9 si terrà il seguente seminario



Titolo: On secondary analysis of datasets that cannot be linked without
errors


Speaker:  Li-Chun Zhang (University of Southampton and Statistics Norway)



Abstract: Unless a unique identifier exists for this purpose, probability
linkage of the datasets will generate linkage errors that can cause bias of
the subsequent analysis, if the linked data are treated as if they were
observed truly. We adopt the perspective of secondary analysts, who we
assume to neither have full access to the linkage key variables nor the
details or tools of the actual linkage procedure, but are only provided
with some non-disclosive linkage comparison data about the record linkage
precision or how the records compare to each other. Three different
approaches are investigated for secondary analysis. First, it is shown that
maximum likelihood estimation may be biased and inconsistent, so that
likelihood inference under linkage error models that generate the linked
data is not viable in general. Next, using linear regression as the
case-in-point, an approach to unbiased regression estimation is devised,
which does not require actually linking the separate datasets. Thirdly, the
conditions by which valid analysis can be obtained based on a subset of the
all links that otherwise could have been made is investigated. This can be
useful for analysis of large population datasets such as that arising from
the Census data linkage project at ONS, where the required computation is
infeasible if one attempts to use all the linkable and unlinkable records.


-- 

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Brunero Liseo
*Dip. di metodi e modelli per il territorio, l'economia e la finanza *
*Sapienza Università di Roma*

*Viale Castro Laurenziano, 9 Roma I-00161 *Tel. +39 06 49766973
<+39%2006%204976%206973>
Fax +39 06 4957606 <+39%2006%20495%207606>
*http://www.memotef.uniroma1.it/users/liseo-brunero
<http://www.memotef.uniroma1.it/users/liseo-brunero>*
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