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Home / Blog / Data Science / What is Data Cleansing?
Bharani Kumar Depuru is a well known IT personality from Hyderabad. He is the Founder and Director of AiSPRY and 360DigiTMG. Bharani Kumar is an IIT and ISB alumni with more than 18+ years of experience, he held prominent positions in the IT elites like HSBC, ITC Infotech, Infosys, and Deloitte. He is a prevalent IT consultant specializing in Industrial Revolution 4.0 implementation, Data Analytics practice setup, Artificial Intelligence, Big Data Analytics, Industrial IoT, Business Intelligence and Business Management. Bharani Kumar is also the chief trainer at 360DigiTMG with more than Ten years of experience and has been making the IT transition journey easy for his students. 360DigiTMG is at the forefront of delivering quality education, thereby bridging the gap between academia and industry.
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In the world of data science, one of the crucial steps before diving into analysis is data cleansing. What is data cleansing? Simply put, it is the process of identifying and rectifying or removing errors, inconsistencies, and inaccuracies from datasets. Data cleansing is an essential aspect of data management and preparation, as it ensures that data is accurate, reliable, and ready for analysis. In this blog, we will explore the key sub-topics of data cleansing, understand its importance, challenges, and discuss various techniques and tools used in this process.
Before we delve into the intricacies of data cleansing, it's important to understand the distinctions between similar terms such as data cleaning and data scrubbing. While data cleansing, data cleaning, and data scrubbing are frequently used interchangeably, it is important to recognize their nuanced distinctions. Data cleaning generally refers to the process of removing or correcting errors, inconsistencies, or Outliers in the dataset. Data scrubbing, on the other hand, is a more comprehensive term that encompasses the identification and elimination of incorrect or irrelevant data, duplicate records, and other data quality issues.
Data cleansing involves a series of steps to ensure the quality and integrity of the dataset. The following steps are typically followed in the data cleansing process:
Implementing a robust data cleansing process yields several benefits. It ensures data accuracy, enhances the reliability of analyses, and minimizes the risk of making decisions based on faulty or incomplete information. Effective data cleansing also saves time by streamlining subsequent data analysis steps and improves the performance of machine learning models by reducing noise and eliminating biases caused by data quality issues.
While data cleansing is critical, it is not without its challenges. Some common challenges include dealing with large datasets, identifying hidden errors, striking a balance between removing noise and preserving valuable information, and adapting to evolving data sources. Additionally, the lack of standardization across data sources and the need for domain expertise in interpreting and addressing data quality issues can pose significant challenges in the cleansing process.
To simplify the data cleansing process, several tools and vendors are available in the market. These tools offer functionalities like automated data profiling, identifying anomalies, handling missing values, and facilitating easy integration with data science workflows. Some popular data cleansing tools include OpenRefine, Trifacta, Talend, and Informatica, among others. The choice of tool depends on the specific requirements and complexity of the data cleansing task.
Data cleansing is a crucial step in the data science journey. By addressing errors, inconsistencies, and inaccuracies, it ensures that analyses and models are built on a foundation of high-quality, reliable data. The steps involved in the data cleansing process, such as typecasting, handling duplicates, outlier analysis, and others, collectively contribute to data integrity. Despite the challenges involved, effective data cleansing yields numerous benefits, making it an indispensable part of any data science project.
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