00286nam a2200121Ia 4500082001900000100001800019245004900037260000900086300001600095490001400111490003400125500000500159  a330.183 Or64b  aOrcutt, G. H.  aActions, consequences and causal relationsb  c1952  app. 305-313  vNov. 1952  aReview of Economic Statistics  a