Data Quality

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Data quality is defined as “an inexact science in terms of assessments and benchmarks” [93]. Similarly high quality data can be described as “data that is fit for use by data consumers” [94].

11.2. Origin of Bad Data

There may be different sources from where erroneous data is originated. Data may become dirty if it is mistakenly entered, received from invalid external data source, or when good data is combined with outdated data and there is no way to distinguish between the two.

11.3. Categories and Dimensions of Data Quality

Since before data was the most valuable asset of an organization and data was rarely shared. Now businesses, governments, and research organizations rely on the exchange and sharing of various forms of data. As there is an increase in interconnectivity among data producers and data consumers; interest in data quality increases steadily. The management of data quality is typically a complex job. For the entire data management process all data quality aspects should be observed. Following table indicates the categories and dimensions of data quality [94]:

Table 11.1 Categories and Dimensions of Data Quality [94]

Categories Dimensions

Intrinsic Accuracy

Objectivity

Believability

Reputation

Contextual Completeness

Timeliness

Relevancy

Value Added

Among of data

Representational Interpretability

Ease of Understanding

Concise/Consistent representation

Accessibility Accessibility

Access security

11.4. Classification of data quality problems in data sources

Data quality problems are classified in two main categories: Single-Source problems and Multi-Source Problems [95]. A brief view of the classification and sub-classification is shown in the figure below that shows som...

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...ng Hai Do, “Data Cleaning: Problems and Current Approaches,” Bulletin of the IEEE Computer Society Technical Committee on Data Engineering, 2000.

[96] M. Angélica Caro, Coral Calero, Ismael Caballero, Mario Piattini, “Data Quality in Web Applications: A State of The Art,” IADIS International Conference on WWW/Internet, 2005.

[97] Panos Vassiliadis, “Data Warehouse Modeling and Quality Issues,” National Technical University of Athens Zographou, Athens, GREECE, 2000.

[98] Larry P. English, “Information Stewardship: Accountability for Information Quality,” Information Impact International, Inc, 2006.

[99] Peter Block, “Stewardship: Choosing Service over Self-Interest,” San Francisco: Berett-Koehler, 1993.

[100] M. Pamela Neely “Data Quality Tools for Data Warehousing – A Small Sample Survey,” Center for Technology in Government University at Albany / SUNY, 1998.

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