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IMLS Library Search & Compare tool
#1
A few people asked how the Institute of Museum and Library Services (IMLS) calculated who is in a library's comparison group and therefore part of your library's Mean (average) and Quartile ranking. The information offered from IMLS states:
"Four sets of groups of similar libraries were constructed based on different sets of variables and using a statistical method that minimizes variation within groups and maximizes variation between groups. The variables used for the Staff Cluster are: MLS librarians, other librarians, and other staff." 
https://www.imls.gov/labs/
I hope this helps.
Best
Rochelle
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