Oh... We can ask about way sub projects were selected, and are they can be called a representative sample. Nevertheless I agree with you: there are no obvious

Oh... We can ask about way sub projects were selected, and are they can be called a representative sample. Nevertheless I agree with you: there are no obvious way to do a better estimation, so words "fair" and "transparent" seem right in place there. Of course only if Karpov does not try to mislead his readers deliberately by choosing sub projects by some criterion that correlates with error rate.