The establishment a federal statistical agency, separate from operating units of a department or agency, may be considered for a number of reasons:
There is a need for information extending beyond the narrow scope of individual operating units and possibly involving other departments and agencies.
There is a need, in fact or as a matter of credibility, to establish the independence of major data series from policy or operating control.
There is a need to protect the confidentiality of responses.
There is an opportunity to achieve greater efficiency or higher quality through a consolidated and more highly professional activity.