PDF
…Handbook (working draft CMH-17 Rev G).
Basis numbers are labeled as ‘values’ when the data meets all the requirements of working draft
CMH-17 Rev G. When those requirements are not met, they will be labeled as ‘estimates.’
When the data does not meet all requirements, the failure to meet these requirements is reported
and the specific requirement(s)…
https://www.wichita.edu/industry_and_defense/NIAR/Research/newport-nct4708/4708-Unitape-3.pdf