Missing Data:
These data have been reviewed and edited at the state and national levels, and verified as correct by each state’s data coordinator. There have been no imputations for non-response, so some data may be missing, indicated as “N/A.” This can result in some libraries not being selected for comparison groups. Imputation is a statistical means for providing a valid value for missing data.

Note about confidentiality and removal of data:
Because public use data must protect the confidentiality of respondents, changes have been made in the public use file used by this tool. For libraries where Librarians and Other Professional Staff is less than or equal to 2.00 FTE, expenditures data for Librarians and Other Professional Staff for those academic libraries have been removed.

Similarly, the expenditures data for All Other Paid Staff and Student Assistants have been removed for those libraries where All Other Paid Staff and Student Assistants respectively are less than or equal to 2.00 FTE. Other Operating Expeditures have been removed to prevent infering these data. In addition, expenditures data for Employee Fringe Benefits Paid by Library have been removed if any saleries data were suppressed.