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Computer Science

Write a program that preprocesses the collection. This preprocessing stage should specifically include a function that tokenizes the text. In doing so, tokenize on whitespace and remove For this task, please use your own implementation of a tokenizer.

INSTRUCTIONS TO CANDIDATES
ANSWER ALL QUESTIONS

Tasks:

  1. Write a program that preprocesses the collection. This preprocessing stage should specifically include a function that tokenizes the text. In doing so, tokenize on whitespace and remove For this task, please use your own implementation of a tokenizer.
  2. Determine the frequency of occurrence for all the words in the collection. Answer the following questions:
    1. What is the total number of words in the collection?
    2. What is the vocabulary size? (i.e., number of unique terms).
    3. What are the top 20 words in the ranking? (i.e., the words with the highest frequencies).
    4. From these top 20 words, which ones are stop-words?
    5. What is the minimum number of unique words accounting for 15% of the total number of words in the collection?

Example: if the total number of words in the collection is 100, and we have the fol- lowing word-frequency pairs:

 

Word                      tf

the of a

data mining

20

10

10

8

7

 

the answer to this question will be (1 word accounts for 15% of the total 100 words).

 

  1. Integrate the Porter stemmer and a stopword eliminator into your code. Answer again questions a.-e. from the previous point. (See below a link to a Java Porter stemmer implementation and to a stopwords list).

 

https://www.dropbox.com/s/rexuzz3j56vi4bt/Porter.java

https://www.dropbox.com/s/5789sj8v07j2id0/stopwords.txt

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