… are descendants of the Okapi systems which were developed at … These early Okapi systems
were experimental highly-… o into a separate library| the Okapi Basic Search System (BSS). …

… In TREC-5, we did some reweighting in addition to selection, which we found moderately
beneficial and which had the effect of increasing our query sizes a little. All of these procedures …

… searches on each of the two systems, Okapi and ZPrise. The sessions were divided into two
… the twenty-four searches on Okapi, Group A used the same interface as in TREC-5, but with …

… This work produced good results on TREC-5 data. Three … For TREC-5 we tried some
reweighting experiments, which … which we had used for TREC-5. Eventually we tried two to four …

… The Okapi search systems used for TREC are descendants of the Okapi systems developed
… These early Okapi systems were experimental highly-interactive reference retrieval systems …

… The focus of the Okapi TREC{6 Chinese experiments is on investigating the e ectiveness of
di … The weighting function we use for Okapi TREC{6 Chinese experiments is given as follows. …

… We use the Okapi ranking formula for this (see Section 4.) While we found that the analyzer
… In producing the o cial TREC-5 results, we use only uncased morphs. We have also studied …

… Based on the results of experiments on TREC-4 and TREC-5, we decided to use a three …
words and Okapi rescoring yielded the most signi cant improvement for TREC-4 and TREC-5, …

The Text REtrieval Conferences (TRECs) are a series of workshops that encourage research
in information retrieval from realistic applications by providing large test collections, uniform …

… In the next section, we will discuss the Okapi probabilistic model and examine its
appropriateness within … Natural language information retrieval: TREC-5 report. In Proceedings …