Abstract
We describe an applied study of ICT students' employment in Estonia based on data from two national registries. The study offered an opportunity to compare results from both k-anonymised data as well as those from the novel Sharemind platform for privacy-preserving statistical computing, which offers a way to use confidential data for research without loss of information. Comparison of results using k-anonymized and lossless data indicate substantial differences in estimates of students' employment rates. The results illustrate, on the basis of a real-world study, how the effects of k-anonymization can lead to considerable bias in estimates. While privacy-preserving computing does entail inconveniences because original microdata is not revealed to the statistician, this can be offset by greater confidence in the results.
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