These are concepts that you should familiarize yourself with. For example: What are Stop Words? What is Text Preprocessing?
Learn what text preprocessing is, the different techniques for text preprocessing and a way to estimate how much preprocessing you may need. For those interested, I’ve also made some text preprocessing code snippets in python for you to try. Now, let’s get started!
Inverse Document Frequency (IDF) is a weight indicating how commonly a word is used. The more frequent its usage across documents, the lower its score. The lower the score, the less important the word becomes. For example, the word the
Term Frequency (TF) Term frequency (TF) often used in Text Mining, NLP and Information Retrieval tells you how frequently a term occurs in a document. In the context natural language, terms correspond to words or phrases. Since every document is
N-grams of texts are extensively used in text mining and natural language processing tasks. They are basically a set of co-occurring words within a given window and when computing the n-grams you typically move one word forward (although you can
Document frequency is the number of documents containing a particular term. Based on Figure 1, the word cent has a document frequency of 1. Even though it appeared 3 times, it appeared 3 times in only one document. The word
