An individual definition question will be scored using nugget recall (R) and an approximation to nugget precision (P) based on length.
r = # essential nuggets returned in response/# essential nuggets P is defined as: if length < allowance, P = 1 else P=1-[(length-allowance)/length] where allowance = 100*(# essential+acceptable nuggets returned) length = total # non-white-space characters in answer strings The F measure is: (2) where β value is fixed three in TrEC 2004, and we also use three to get comparable result.