Similarity Shrinkage

[taolian]

In Section 5.2 of Herlocker 1999 and Table 2 of Herlocker 2002, the significance weighting or shrinkage parameter for the similarity value takes the form of the fraction of the number of common elements and a threshold, for example, min(n/50, 1).

Line 546 of Recommder.java
I am wondering whether there is any advantage of sim *= n / (n + shrinkage + 0.0); over sim *= Math.min(n / (double)shrinkage, 1.0); or other considerations here.

[guoguibing]

Just two different ways to shrink similarities.