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Data Quality

At dataquality.dev, our mission is to provide a comprehensive platform for analyzing, measuring, understanding, and evaluating data quality. We aim to empower businesses and individuals with the knowledge and tools necessary to make informed decisions based on accurate and reliable data. Our goal is to create a community of data quality enthusiasts who share their expertise and insights to help others improve their data quality practices. We believe that high-quality data is essential for driving innovation, improving efficiency, and achieving success in today's data-driven world.

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Introduction

Data quality is a critical aspect of any data-driven organization. Poor data quality can lead to incorrect decisions, lost revenue, and damaged reputation. Therefore, it is essential to understand the concepts, topics, and categories related to data quality. This cheat sheet provides a comprehensive reference guide for anyone getting started with data quality.

Data Quality Concepts

  1. Data Quality Definition: Data quality refers to the accuracy, completeness, consistency, and timeliness of data. It is a measure of how well data meets the requirements of its intended use.

  2. Data Quality Dimensions: Data quality has six dimensions: accuracy, completeness, consistency, timeliness, uniqueness, and validity. These dimensions help to evaluate the quality of data.

  3. Data Quality Assessment: Data quality assessment is the process of evaluating the quality of data. It involves identifying data quality issues, measuring the severity of those issues, and determining the root cause of the issues.

  4. Data Quality Control: Data quality control is the process of ensuring that data meets the required quality standards. It involves implementing procedures and processes to prevent data quality issues from occurring.

  5. Data Quality Improvement: Data quality improvement is the process of enhancing the quality of data. It involves identifying data quality issues, determining the root cause of those issues, and implementing corrective actions to improve data quality.

Data Quality Topics

  1. Data Profiling: Data profiling is the process of analyzing data to understand its structure, content, and quality. It involves identifying data quality issues, such as missing values, duplicates, and inconsistencies.

  2. Data Cleansing: Data cleansing is the process of correcting or removing data quality issues. It involves identifying and correcting errors, removing duplicates, and standardizing data.

  3. Data Matching: Data matching is the process of identifying and linking records that refer to the same entity. It involves comparing data from different sources and identifying matches based on specific criteria.

  4. Data Integration: Data integration is the process of combining data from different sources into a single, unified view. It involves identifying and resolving data quality issues, such as duplicates and inconsistencies.

  5. Data Governance: Data governance is the process of managing the availability, usability, integrity, and security of data. It involves establishing policies, procedures, and standards for data management.

Data Quality Categories

  1. Data Accuracy: Data accuracy refers to the correctness of data. It involves ensuring that data is free from errors and reflects the true state of the entity it represents.

  2. Data Completeness: Data completeness refers to the extent to which data contains all the required information. It involves ensuring that all necessary data is present and that there are no missing values.

  3. Data Consistency: Data consistency refers to the degree to which data is uniform and conforms to predefined standards. It involves ensuring that data is consistent across different sources and that there are no contradictions.

  4. Data Timeliness: Data timeliness refers to the degree to which data is up-to-date and relevant. It involves ensuring that data is available when needed and that it reflects the current state of the entity it represents.

  5. Data Uniqueness: Data uniqueness refers to the degree to which data is distinct and does not contain duplicates. It involves ensuring that each record represents a unique entity.

  6. Data Validity: Data validity refers to the degree to which data conforms to predefined rules and standards. It involves ensuring that data is accurate, complete, consistent, timely, and unique.

Conclusion

Data quality is a critical aspect of any data-driven organization. It is essential to understand the concepts, topics, and categories related to data quality to ensure that data meets the required quality standards. This cheat sheet provides a comprehensive reference guide for anyone getting started with data quality. By following the guidelines outlined in this cheat sheet, organizations can improve the accuracy, completeness, consistency, timeliness, uniqueness, and validity of their data.

Common Terms, Definitions and Jargon

1. Accuracy: The degree to which data reflects the true value or state of the entity it represents.
2. Aggregation: The process of combining multiple data points into a single summary value.
3. Anomaly: A data point that deviates significantly from the expected or normal pattern.
4. Attribute: A characteristic or property of a data entity.
5. Bias: A systematic error or tendency in data collection or analysis that leads to inaccurate results.
6. Cleansing: The process of identifying and correcting errors, inconsistencies, and redundancies in data.
7. Completeness: The degree to which data contains all the necessary information for its intended purpose.
8. Consistency: The degree to which data is uniform and conforms to established standards or rules.
9. Context: The circumstances or conditions surrounding the collection, storage, and use of data.
10. Correlation: The degree to which two or more variables are related or associated with each other.
11. Data Governance: The set of policies, procedures, and standards that govern the management and use of data within an organization.
12. Data Integration: The process of combining data from multiple sources into a single, unified view.
13. Data Lineage: The documentation of the origin, movement, and transformation of data throughout its lifecycle.
14. Data Management: The process of organizing, storing, protecting, and maintaining data assets.
15. Data Model: A representation of the structure, relationships, and constraints of data entities and attributes.
16. Data Profiling: The process of analyzing and assessing the quality and characteristics of data.
17. Data Quality: The degree to which data meets the requirements and expectations of its intended use.
18. Data Quality Assessment: The process of evaluating and measuring the quality of data against established criteria.
19. Data Quality Framework: A structured approach to managing and improving data quality.
20. Data Quality Metrics: Quantitative measures used to assess and monitor the quality of data.

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