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Recently, Sakai proposed two methods for determining the topic set size n for a new test collection based on variance estimates from past data: the first method determines the minimum n to ensure high statistical power  , while the second method determines the minimum n to ensure tight confidence invervals  . These methods are based on statistical techniques described by Nagata . While Sakai  used variance estimates based on oneway ANOVA, Sakai  used the 95% percentiledblp:conf/ntcir/Sakai14 fatcat:4aqkx36gxzcnjnjl722snjeqee