1. accurate information
2. organized information
3. timely information
4. verifiable information
5. accessible information
6. economical information
7. useful information
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A good quality data is one that have the following characteristics. A good quality data must not be redundant. It must be verifiable and integrated. It must be updated timely. It is well organized.
Quantitative data is quantity - how much. Qualitative data is quality - is it good? what is it like?
Data Integrity
Viewing the data is an easy way to see some of their characteristics such as trends, seasonality, outliers, relationship between variables (linear, quadratic, power etc).
There are four key characteristics which separate the data warehouse from other major operational systems:Subject Orientation: Data organized by subjectIntegration: Consistency of defining parametersNon-volatility: Stable data storage mediumTime-variance: Timeliness of data and access terms
Ungrouped data is data that is not grouped in a specific order. Grouped data is a set of data that has unique characteristics in common.