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.
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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.