Table 2. The Effect of Temporal Partitioning on the Sample Sizes of the Created Subsetsa


	ntot	m	ntot/m

All	432	1	432
Month/all years	432	4	108
Month	432	18	24
SR/SS	378	26	14.5
Day	77	8	9.6

aAt each level of partitioning, the total number of retrievals ntot is partitioned into m subsets. ntot/m then gives the average sample size of each subset. ntot may change since any subsets with less than eight samples are excluded.