Meaning of secondary data
Secondary data are derived, sanitized (for classification and proprietary purposes), or changed in some way from the original source data. Examples include documented cost estimates, factors and factor books, studies and white papers, contractor cost report summaries, subcontractor cost data, etc. Secondary data tends to be of a lesser overall quality and usefulness to the cost analyst for any of many possible reasons. Examples of possible reasons are because the normalization process used on it is unknown, there is a lack of definition associated with the data, or the basis for a factor is old, incomplete or questionable in some way. Secondary data is, however, very valuable when used in combination with other data for cross-checking purposes.
Source: http://www.sceaonline.org/prof_dev/CEBoK-Glossary.xls
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