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doi:10.1016/0306-4573(90)90049-8 
Copyright © 1990 Published by Elsevier Science Ltd. All rights reserved.
On sample sizes for non-matched-pair IR experiments
Received 20 September 1989;
accepted 6 June 1990.
Available online 19 July 2002.
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Abstract
The problem of determining an adequate sample size, for an information retrieval experiment comparing two systems on separate samples of requests, is discussed. Minimal sample sizes under different assumptions are derived. It is concluded that such experiments are very likely to require samples of considerable size.
