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When non-response makes estimates from a census a small area estimation problem: the case of the survey on graduates’ employment status in Italy

Author

Listed:
  • Maria Giovanna Ranalli

    (University of Perugia)

  • Fulvia Pennoni

    (University of Milano-Bicocca)

  • Francesco Bartolucci

    (University of Perugia)

  • Antonietta Mira

    (Università della Svizzera italiana
    University of Insubria)

Abstract

Since 1998, AlmaLaurea—a consortium of 80 Italian universities and a member of the Italian National Statistical System—has conducted an annual census on graduates’ employment status. The survey provides estimates of descriptive indicators at both the population level and for specific subpopulations (domains) of interest, such as degree programmes. Some domains have very few observations due to a small population size and non-response. In this paper, we address this estimation problem within a Small Area Estimation framework. Specifically, we propose using generalized linear mixed models that incorporate two variables as proxies for graduates’ response propensity, making the assumption of non-informative non-response more plausible. Degree programme estimates of employment rates are derived as (semi-parametric) empirical best predictions using a finite mixture of logistic regression models, with their mean squared error estimated via a second-order, bias-corrected, analytical estimator. Sensitivity analysis is conducted to assess the explanatory power of variables modelling response propensity and to evaluate potential correlations between area-specific random effects and observed heterogeneity.

Suggested Citation

  • Maria Giovanna Ranalli & Fulvia Pennoni & Francesco Bartolucci & Antonietta Mira, 2025. "When non-response makes estimates from a census a small area estimation problem: the case of the survey on graduates’ employment status in Italy," Advances in Data Analysis and Classification, Springer;German Classification Society - Gesellschaft für Klassifikation (GfKl);Japanese Classification Society (JCS);Classification and Data Analysis Group of the Italian Statistical Society (CLADAG);International Federation of Classification Societies (IFCS), vol. 19(2), pages 515-543, June.
    • Handle: RePEc:spr:advdac:v:19:y:2025:i:2:d:10.1007_s11634-025-00630-z
    DOI: 10.1007/s11634-025-00630-z
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    References listed on IDEAS

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