Exercise 2.4

For the Porter stemmer rule group shown in (2.1):

1. What is the purpose of including an identity rule such as SS → SS?

   To identify such term belong to adjective.

2. Applying just this rule group, what will the following words be stemmed to?

   circus canaries boss

   circuscanari boss

3. What rule should be added to correctly stem pony?

   IESS → Y

4. The stemming for ponies and pony might seem strange. Does it have a deleterious effect on retrieval? Why or why not?

   No, it does not have high deleterious effect on retrieval result because poni as result of stemming of ponies and pony_have been stored at index at first will always matched with _poni from post processed term of query.