How Data Science Helps Understand Public Opinion


Sentiment analysis, a subfield of natural language processing (NLP), leverages data science techniques to understand and analyse public opinion from text data. Data science can contribute to sentiment analysis in several ways. The social and societal implications of data sciences are being recognised widely. The scope of data science cannot be limited to the technology area. For instance, customer retention and customer experience enhancement are areas where sentiment analysis enabled by data sciences can play a major role.  Customer psychology can be better understood by sentiment analysis. The data scientist courses in commercialised cities, such as a Data Science Course in Pune or Mumbai, would include substantial coverage on sentiment analysis, especially in courses meant for business analysts. 

The Process of Sentiment Analysis

Sentiment analysis is preceded by the usual routine of data cleaning and  extraction. Subsequently, machine learning modelling, and optimising techniques are used. The following is an outline of the processes involved in sentiment analysis.

  • Text Preprocessing: Data scientists preprocess text data to clean and prepare it for analysis. This involves tasks such as tokenisation (breaking text into individual words or phrases), removing stop words (commonly occurring words with little semantic value), and stemming/lemmatisation (reducing words to their root form). Preparing data for any analysis is a fundamental step in data analysis and forms part of a Data Scientist Course.
  • Feature Extraction: Data scientists extract features from text data to represent it in a format suitable for analysis. This may involve techniques like bag-of-words or TF-IDF (term frequency-inverse document frequency) to represent the importance of words in a document relative to a corpus of documents.
  • Sentiment Lexicons and Dictionaries: Data scientists use sentiment lexicons and dictionaries, which contain lists of words along with their associated sentiment scores (positive, negative, or neutral). These lexicons help in categorising text data based on sentiment polarity. Business analysts and business strategists need to perform data analysis for the purpose of building and sustaining customer bases. In commercialised cities, there is a great demand among business analysts for courses that cover sentiment analysis. In view of this demand, a Data Scientist Course in Pune or Delhi or Bangalore that is specifically fine-tuned for business analysts and strategists might cover how sentiment analysis can be used for predicting customer behaviour and enhancing customer engagement and loyalty.   
  • Machine Learning Models: Data scientists employ machine learning algorithms to train sentiment analysis models. Supervised learning algorithms, such as support vector machines (SVM), logistic regression, or deep learning models like recurrent neural networks (RNNs) and convolutional neural networks (CNNs), are commonly used for sentiment classification tasks.
  • Model Training and Evaluation: Data scientists split the dataset into training and testing sets and train the sentiment analysis model on the training data. They evaluate the model’s performance using metrics such as accuracy, precision, recall, and F1-score to assess its effectiveness in predicting sentiment.
  • Sentiment Classification: Data scientists use the trained model to classify the sentiment of text data into categories such as positive, negative, or neutral. The model assigns a sentiment score or label to each piece of text based on the learned patterns from the training data.
  • Fine-tuning and Optimisation: Data scientists iterate on the model architecture and hyperparameters to improve its performance. Techniques such as cross-validation, hyperparameter tuning, and ensemble methods may be employed to optimise the sentiment analysis model further.
  • Real-time Analysis and Monitoring: Data scientists develop systems for real-time sentiment analysis and monitoring of public opinion on social media platforms, news articles, customer reviews, and other sources of text data. These systems continuously analyse incoming data streams and provide insights into evolving sentiment trends. Real-time analysis  of data, however, is not a requirement limited to sentiment analysis. It is a skill that businesses need to acquire to effectively respond to the rapidly changing market dynamics and forms part of any Data Science Course.
  • Topic Modelling and Contextual Analysis: Data scientists integrate topic modelling techniques such as latent Dirichlet allocation (LDA) or latent semantic analysis (LSA) to understand the context in which sentiment is expressed. This helps in capturing nuanced sentiment nuances and identifying topics that drive specific sentiments.
  • Visualisation and Reporting: Data scientists use data visualisation techniques to present the results of sentiment analysis in an interpretable format. Visualisations such as word clouds, sentiment heatmaps, and sentiment timelines help stakeholders understand public opinion trends and patterns.


By leveraging data science techniques, sentiment analysis enables businesses, organisations, and policymakers to gain valuable insights into public opinion, customer sentiment, brand perception, and market trends, thereby informing decision-making processes and strategic planning efforts. Sentiment analysis is an example of how data sciences are being applied even to areas that were hitherto considered not directly related to the effectiveness of business strategies. Such specialised topics are increasingly being assimilated into the curriculum of any inclusive, futuristic Data Science Course.

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