Economics, Econometrics and Finance is significantly higher than the second ranked subject area for 2011, 2015 and 2016, and close to significance in 2014.
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A systematic method for identifying references to academic research in grey literature.
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There are no clear and obvious statistically significant differences between consecutive years, and although there appears to be a slight trend of increasing proportion as the years go on, this is not a solid conclusion as there are at least 3 years (2011, 2014 and 2016) where the proportion decreases from the previous year.