However, this is something that is going to change in the future, as it is very likely that what we now consider non-traditional data will play an increasingly relevant role into official statistics. Big data often include sensitive data like personal data or privately owned data.
Data collection is a big issue as access to data is not always easy, in particular, because most central banks are not endowed with a broad mandate to collect data, beyond that of the financial sector for which we have legal responsibility.