Data verification definition
Data verification refers to the process of ensuring that data is accurate, complete, and consistent. It is a critical step in data quality management and involves comparing data against a known and trusted source to check for errors and inconsistencies.
See also: file hash, integrity checking
Methods of data verification:
- Double entry involves entering data twice and comparing the two entries for consistency. This method is useful in identifying errors such as typos or incorrect data entry.
- Sampling is useful in identifying patterns and trends in the data and involves selecting a representative sample of data and verifying its accuracy.
- Field checks include verifying the accuracy of data entered into specific fields or columns.
- Cross-referencing compares data from multiple sources to ensure consistency and accuracy.
Data verification challenges:
- Limited scope. It may only verify a sample of data or specific fields, which means that errors in other parts of the data set may go undetected.
- Human error. Since it involves human judgment, the verification process can lead to errors or biases.
- Time. It can be a time-consuming process, especially for large data sets.
- Cost. It may require specialized tools or expertise, which can be expensive to implement.
- Outdated data. It has to be repeated because the data changes or can become outdated.
