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the sum used for prediction. The results of these studies Indicate that 015 and RIDGE , wi th one exception , always outperformed UNIT w ith respect to producing smaller errors of prediction and , what is more Important, RIDGE always did better than OLS. The one exception in which UNIT did better than OLS and RIDGE i s for the case i n whi ch all the " true" coefficien ts are pos iti ve , not too far apart , and the sample size Is relatively small (< 50). This is a very restricted class ofdoi:10.21236/ada059561 fatcat:4p7ikicm3vcxfo24ahg2gvfz74