The branching rules worked to include respondents with unspecified information on critical questions among the (regular) Customers.
Respondents to Address of Source Query
The last set of figures does not imply that all respondents correctly identified their source by type or that all the answers they submitted were good. About 25%of the respondents to the news group question identified their source as something other than a newsgroup. About 10%of the answers to the other queries were not valid.