Hey Arne
I don't know about the rounding, but you shouldn't be concerned with the
calculation of Q^2. In the line where a value is assigned to RSS, the value
is assigned to h+1 as shown here:
RSS[h + 1, ] = colSums((Y.old - t.new %*% t(c.new))^2)
i.e. the programmer is messing with the index, which is poor for the
readability, but explains the line you showed:
Q2[h] = 1 - PRESS[h]/RSS[h]
Hope it helps :)
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