Quotation queries are usually longer than other queries and are also more unique (the same quotation query is rarely repeated). Overall however, the quotation queries make a formidable share of queries.
To estimate the quality of quotation search, the search engines are tested using 50 queries, randomly selected from the whole array of quotation queries. Each query has one or more text fragments that must be included in the text of the pages listed in the search results. The Top 10 results are checked for these text fragments (called ‘marker fragments’). For each search engine, we calculate the percentage of queries, for which the marker fragment was found in Top 10. This number is used as the aggregate indicator of the quality of quotation search.
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