By Michael Rans
The Humanitarian Data Exchange (HDX) is adding a new mandatory metadata field called Expected Update Frequency. It replaces a previous optional field, Update Frequency, and its purpose is to tell us how often datasets shared through the site are likely to be updated.
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We are drawing on research being done on data freshness at Vienna University. Specifically, the researchers are looking at estimating the next change time for a resource based on previous update history and applying a Markov chain approach. The research is still ongoing but we hope to learn from their results to enhance HDX.
Let us know what you think of this approach. Send feedback to hdx@un.org. Watch this space! There will be more coming on the subject of Data Freshness.