Administrative data is a type of big data that typically covers the entire population subject to administration, allowing for research at regional and small-group levels. It has the advantage of being free from non-response, memory errors, and false responses and of naturally obtaining panel data structures. However, there are cases where administrative data is less accurate than survey data, and the use of data from particular administrative agencies is very limited, so it can be of considerable utility only when linked with other administrative data or survey data.
For evidence-based policies, especially for policy evaluation and design at the regional level, such as regional social security plans, it is crucial to link various administrative data and survey data. Based on the experience of the past few years since the enactment of the three data laws, legal and administrative improvement measures should be sought.
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