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INICIO | 29 de marzo de 2024
  

The post randomisation method for protecting microdata.

Título inglés The post randomisation method for protecting microdata.
Título español El método de la postaleatorización para protección de microdatos.
Autor/es Gouweleeuw, José ; Kooiman, Peter ; Willenborg, Leon ; De Wolf, Peter-Paul
Organización Dep. Statist. Meth. Statistics Netherlands, Amsterdam, Holanda
Revista 0210-8054
Publicación 1998, 22 (1): 145-156, 6 Ref.
Tipo de documento articulo
Idioma Inglés
Resumen inglés This paper describes the Post Randomisation Method (PRAM) for disclosure protection of microdata. Applying PRAM means that for each record in the data file according to a specified probability mechanism the score on a number of variables is changed. Since this probability mechanism is known, the characteristics of the latent true data can unbiasedly be estimated from the observed data moments in the perturbed file.
PRAM is applied to categorical variables. It is shown that both cross-tabulation and standard multivariate analysis techniques can easily be adapted to account for PRAM. It only requires pre-multiplication by the transpose of the inverted Markov transition matrix, specifying the randomisation process. Also, estimates for the additional variance introduced by PRAM are given. By a proper choice of the transition probabilities, PRAM can be applied in such a way that certain chosen marginal distributions in the original file are left invariant in expectation. In that case the perturbed data can be used as if it were the original data. We describe how to obtain such an invariant PRAM process. Finally, some consequences of using PRAM in practice are discussed. The present paper is a shortened version of Kooiman et al. (1997).
Clasificación UNESCO 120913
Palabras clave español Protección de datos ; Proceso de Markov ; Estimación insesgada
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Equipo DML-E
Instituto de Ciencias Matemáticas (ICMAT - CSIC)
rmm()icmat.es