Unreliable Data.
It has been my experience, as well as many others who have
looked; data is generally much less accurate than it is
advertised to be. This is not a trivial point - we depend
on initial data for many decisions, as well as for the
input data for simulations which result in decisions.
Since the errors are of so many kinds and I have no
coherent theory to explain them all, I have therefore
to resort to isolated examples and generalities from them.
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