Twitter Data Cleaning and Preprocessing for Data Science
In the past decade, new forms of communication, such as microblogging and text messaging have emerged and become ubiquitous. While there is no limit to the range of information conveyed by tweets and texts, often these short messages are used to share opinions and sentiments that people have about what is going on in the world around them.
Opinion mining (known as sentiment analysis or emotion AI) refers to the use of natural language processing, text analysis, computational linguistics, and biometrics to systematically identify, extract, quantify, and study affective states and subjective information. Sentiment analysis is widely applied to voice of the customer materials such as reviews and survey responses, online and social media, and healthcare materials for applications that range from marketing to customer service to clinical medicine.
Both Lexion and Machine learning-based approach will be used to for Emoticons based sentiment analysis. Firstly we stand up with the Machine Learning based clustering. In MachineLearning based approach we are used Supervised and Unsupervised learning methods. The twitter data are collected and given as input in the system. The system classifies each tweets data as Positive, Negative and Neutral and also produce the positive, negative and neutral no of tweets of each emoticon separately in the output. Besides being the polarity of each tweet is also determined on the basis of polarity.
Collection of Data
To collecting the twitter data, we have to do some data mining process. In that process, we have created our own applicating with help of twitter API. With the help of twitter API, we have collected a large no of the dataset . From this, we have to create a developer account and register our app. Here we received a consumer key and a consumer secret: these are used in application settings and from the configuration page of the app we also require an access token and an access token secrets which provide the application access to Twitter on behalf of the account. The process is divided into two sub-process. This is discussed in the next subsection.
Accessing Twitter Data and Strimming
To make the application and to interact with twitter services we use Twitter provided REST API. We use a bunch of Python-based clients. The API variable is now our entry point for most of the operations we can perform with Twitter. The API provides features to access different types of data. In this way, we can easily collect tweets (and more) and store them in the system. By default, the data is in JSON format, we change it to txt format for easy accessibility.
In case we want to “keep the connection open”, and gather all the upcoming tweets about a particular event, the streaming API is what we need. By extending and customizing the stream-listener process, we processed the incoming data. This way, we gather a lot of tweets. This is especially true for live events with worldwide live coverage.
Data Pre-Processing and Cleaning
The data pre-processing steps perform the necessary data pre-processing and cleaning on the collected dataset. On the previously collected dataset, the are some key attributes text: the text of the tweet itself, created_at: the date of creation,favorite_count, retweet_count: the number of favourites and retweets, favourited, retweeted: boolean stating whether the authenticated user (you) have favourited or retweeted this tweet etc.
We have applied an extensive set of pre-processing steps to decrease the size of the feature set to make it suitable for learning algorithms. The cleaning method is based on dictionary methods.
Data obtained from twitter usually contains a lot of HTML entities like < > & which gets embedded in the original data. It is thus necessary to get rid of these entities. One approach is to directly remove them by the use of specific regular expressions. Hare, we are using the HTML parser module of Python which can convert these entities to standard HTML tags. For example < is converted to “<” and & is converted to “&”. After this, we are removing this special HTML Character and links. In decoding data, this is the process of transforming information from complex symbols to simple and easier to understand characters. The collected data uses different forms of decoding like “Latin”, “UTF8” etc.
In the twitter datasets, there is also other information as retweet, Hashtag, Username and modified tweets. All of this is ignored and removed from the dataset.
Stop words are generally thought to be a “single set of words”. We would not want these words taking up space in our database. For this using NLTK and using a “Stop Word Dictionary” . The stop words are removed as they are not useful.All the punctuation marks according to the priorities should be dealt with. For example: “.”, “,”,”?” are important punctuations that should be retained while others need to be removed. In the twitter datasets, there is also other information as retweet, Hashtag, Username and Modified tweets. All of this is ignored and removed from the dataset. We should remove these duplicates, which we already did. Sometimes it is better to remove duplicate data based on a set of unique identifiers. For example, the chances of two transactions happening at the same time, with the same square footage, the same price, and the same build year are close to zero.
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To read previous part of the series -
https://medium.com/@sayanmondal2098/sentimental-analysis-of-twitter-emoji-64432793b76f
