p. 197, three lines from the bottom read∑r=1min(i,j)bribrj for ∑r=1min(i,j)birbjr p. 198, line 8 readbij=αj-i for bij=αj-1 line 9 readαi-rαj-r for αr-iαr-j line 10 read ∑r=0jαrαr+n-i-j for ∑r=0jαrαr+n-i+j five lines from bottomread∑t=h+1n(∑i=0hβixl-i)2/σ2