TREC-5: Track Framework (cont.)
Experimental design:
4 searchers S1…S4
4 blocks of 3 topics each B1…B4
An experimental IR system E
A common control IR system C
Assignment of searchers to conditions:
B1 B2 B3 B4
S1 E C
S2 E C
S3 E C
S4 C E
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