What is Sentiment Analysis? A Definitive Guide Text Analysis and Sentiment Analysis Solutions

Getting Started with Sentiment Analysis on Twitter

NLTK is a standard Python package that comes with ready-to-use functions and utilities. It’s one of the most popular computational linguistics and natural language processing packages. In NLTK, a dataset is referred to as a corpus, and a corpus is essentially a set of sentences used as input. Detecting sentiment might be difficult when systems can’t understand the context or tone. When the context is not provided, answers to polls or survey questions like “nothing” or “everything” are difficult to categorize. They could be characterized as positive or negative depending on the question.

types of sentiment analysis

The most common use case of sentiment analysis is on textual data where we use it to help a business monitor the sentiment of product reviews or customer feedback. Different social media platforms also use it to check the sentiment of the posts and if the sentiment of a post is very strong or violent, or below their threshold, they either delete it or hide it. The primary role of machine learning in sentiment analysis is to improve and automate the low-level text analytics functions that sentiment analysis relies on, including Part of Speech tagging. For example, data scientists can train a machine learning model to identify nouns by feeding it a large volume of text documents containing pre-tagged examples. Using supervised and unsupervised machine learning techniques, such as neural networks and deep learning, the model will learn what nounslook like.


Function, append the metrics in the list, compute the loss, backpropagate and improve the performance via Adam optimizer, and calculate the accuracy. You’ll perform the same on the validation set except for the backpropagation and improving the score as validation sets are used to measure the performance of the model, not to train them. These help us learn representation for text where words that have the same meaning have a similar representation. There are pre-trained word embeddings also available which can be used in your models. Train_data[‘Sentiment’].value_counts()
You will import some plotting libraries too so that you can do some basic visualization to get a better understanding of the dataset.

types of sentiment analysis

This tool’s great flexibility allows you to analyze anything from sentences to very long documents, including batches of text. In addition, it is very versatile, so it can be used for other purposes such as ranking opinions or predicting review ratings. Sometimes, when we see a message, a critique or review, or receive a document from a customer, it is not clear if it is a joke, has a hidden intention or if it is ironic. Most probably yes, since it is very difficult to determine what the sender really means, unless they clearly communicate the intention of a message, which is not always possible. Following your brand and your competition on social media in real-time will help you reveal new trends as they pop up and adjust to the newly-appearing demands.

Emotion detection

For instance, it’s still difficult for technology to show the difference between messages with genuine attitude and sarcasm, fake messages and real ones or pinpoint the context behind a certain word. This type of sentiment analysis is used to determine types types of sentiment analysis of feelings through text. With the help of machine learning algorithms and lexicons, such an analysis can show what kind of emotion prevails and is presented in a text. Understanding feelings will help understand customers better and improve their business.


There are different algorithms that you can use to perform sentiment analysis. As for which algorithm you should use, depends on the size of the data you need to analyze and the accuracy that each algorithm provides. Let’s dive a little deeper and discuss the various sentiment analysis algorithms.

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However, let’s say sentiment analysis software uses a rule-based approach. It will count all the negative and positive words and then make up a sentiment score. In this case, we have seven negative words and one positive word, meaning the sentiment of this review would be considered negative by the sentiment analysis software.

This can be compared to a 5-star rating system in terms of opinion. This can help you stay on top of emerging trends and rapidly identify any PR crises or product issues before they escalate. Let’s walk through how you can use sentiment analysis and thematic analysis in Thematic to get more out of your textual data.

As customers generate more and more reviews and comments online daily, it’s evident how important it is to process this data and draw conclusions promptly. Sentiment analysis provides an understanding of how your clients feel about your brand and product and how you can improve your services. Based on natural language processing and constantly progressing machine learning techniques, sentiment analysis serves multiple use cases, including brand monitoring and market research. Further, the sentiment analysis model has to understand what it means if a person says that the nacho tasted “microwaved” and that the calamari was “rubbery”. In aspect-based sentiment analysis, the machine learning model is trained to learn these contexts. Once trained, when such sets of reviews are fed into the system, the model can identify them as negative or positive, and thus assign the sentiment score to each aspect.

  • There is a phenomenon called “garbage in, garbage out,” which means that if we use weak-quality data to create a sentiment analysis model, it cannot work well.
  • Thirdly, it’s becoming a more and more popular topic as artificial intelligence, deep learning, machine learning techniques, and natural language processing technologies are developing.
  • Making sense of long comments, especially those with multiple themes can be difficult when trying to score them as positive or negative.
  • Even people’s names often follow generalized two- or three-word patterns of nouns.

For example, a customer might say, “I wish the platform would update faster! The first sentence is clearly subjective and most people would say that the sentiment is positive. The second sentence is objective and would be classified as neutral. Customers want to know that their query will be dealt with quickly, efficiently, and professionally.

As a lot of the sentiment analysis we do as humans is subjective, it’s unrealistic to expect a sentiment analysis tool to be accurate 100 percent of the time. Data scientists are getting better at developing more accurate sentiment classifiers, but there’s still a way to go. Lastly, sentiment analysis can help analyze data used by HR teams to understand what makes employees happy or why they’re leaving a company. By identifying common complaints types of sentiment analysis and issues, employers get actionable insights into how to reduce turnover and improve employee performance. This capability is especially useful for companies with a lot of employees, as management would not have the time to speak to hundreds of staff members individually. To determine the polarity of a piece of text, sentiment analysis tools must first break it down into individual components, i.e. words and phrases, using NLP.

And since the machines learn from the humans by the data they feed, sentiment analysis classifiers are not as accurate as other types. For example, you must preprocess the tweets and convert the eastern emojis and western emojis into tokens. Further, whitelist them, which will improve your sentiment analysis performance. These rules contain different natural language processing techniques developed in computational linguistics like stemming tokenization, parsing, lexicons, or part of speech tagging. As a result, you do not have to spend time and effort after the audience who does not intend to buy anything soon.

The process of discovery of these attributes or features and their sentiment is called Aspect-based Sentiment Analysis, or ABSA. For example, for product reviews of a laptop you might be interested in processor speed. An aspect-based algorithm can be used to determine whether a sentence is negative, positive or neutral when it talks about processor speed. Automatic methods, contrary to rule-based systems, don’t rely on manually crafted rules, but on machine learning techniques. A sentiment analysis task is usually modeled as a classification problem, whereby a classifier is fed a text and returns a category, e.g. positive, negative, or neutral.