LJ Index 2016: What is E-Circ and Why Did We Add It?
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Historically, the four measures included in the Library Journal Index of Public Library Service (sponsored by Baker & Taylor’s Bibliostat) have been circulation, library visits, program attendance, and public Internet computer use. Now, the design of the LJ Index is beginning to evolve. The stars have finally aligned to add a fifth statistical measure to the scoring—circulation of electronic materials, or e-circ for short. Because the LJ Index is based on data collected by the Public Libraries Survey (PLS)—a federal-state cooperative project of IMLS and the state library agencies—the Index could not add new measures until PLS did.
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