Researchers attempted to collect original research data from a random set of 516 studies published between 1991 and 2011.
While all data sets were available two years after publication, the odds of obtaining the underlying data dropped by 17 per cent per year after that, they reported.
"Publicly funded science generates an extraordinary amount of data each year," UBC visiting scholar Tim Vines said. "Much of these data are unique to a time and place, and is thus irreplaceable, and many other data sets are expensive to regenerate.
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