Researcher, data scientist and Big Data research coordinator with a keen interest in the (re-)use of secondary data for statistical purposes.
Secondary data is data collected by others such as administrative data (e.g. registers) and Big Data. Examples of Big data sources are sensory data (traffic loops), social media messages, and texts on web pages. See my papers for examples of my work (www.pietdaas.nl/pubs) or my presentations on slideshare (http://www.slideshare.net/pietdaas/presentations).