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In a proxy cache for federations of scientific databases it is important to estimate the size of a query before making a caching decision. With accurate estimates, near-optimal cache performance can be obtained. On the other extreme, inaccurate estimates can render the cache totally ineffective. We present classification and regression over templates (CAROT), a general method for estimating query result sizes, which is suited to the resource-limited environment of proxy caches and thedoi:10.1145/1188455.1188562 dblp:conf/sc/MalikBCS06 fatcat:6avilhqbkzh6flkugosxtic57u