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Summary: The number of results provided on the search results page is inaccurate.
Cause: The number of results provided on the search results page or in the search results XML is only an estimate, and should not be considered to be an exact count of the number of matching documents.
Workaround: Use the rc=1 request parameter to request an accurate result count for up to 1M documents.
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None of these numbers are exact. It's not a bug per se either.
That count is an estimate. What makes it hard to produce an accurate number is that your query is run in parallel across a number of machines. The final result count is extrapolated from the results returned and incorporates a number of factors. Google doesn't want to actually return all of the results for a query, just the first few that really matter and then it estimates how many total results there are for the query. It'll go fetch the others later if you page through extra pages (which very few people do).
As with many extrapolations the end estimate van vary dramatically based on factors such as the data returned from various machines (one machine could hold a skewed representation of the Internet and so over/under estimate the total results for that query) and can also vary depending on which datacenter the query hits since the index is constantly in flux. It's way more complicated than this but you get the idea.
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The answer to the headline's question "Is Google Guilty Of Deliberate Query Sabotage?" is no. We've talked about the fact that results estimates are just estimates for years, see e.g. http://video.google.com/videoplay?docid=-4814548594071648913# or http://www.youtube.com/watch?v=2ix3mHeL7hg for more details, including the fact that we only return three significant digits on our results estimates.
As to why the query [A B -C] can return more estimated results than [A B], that's easy to explain. The query [A B -C] causes us to go deeper through our posting lists looking for matches, which can lead to more accurate (and larger) results estimates. Other things can cause us to go deeper in finding matches, such as clicking deeper in search results. Results estimates can also vary based on which data centers or indices your query hits, as well as what language you're searching in. It certainly has nothing to do with whether you're a "possible enemy of Google," as you put it.
We try to be very clear that our results estimates are just that–estimates. In theory we could spend cycles on that aspect of our system, but in practice we have a lot of other things to work on, and more accurate results estimates is lower on the list than lots of other things.
Цитата: Hellerick от июля 9, 2015, 08:26Но зачем-то же пишется это число на последней странице.
Кроме надписи на последней странице, выдаваемой гуглом, у нас нет других причин сомневаться в истинности количества рузультатов, указанных на первой странице.
Цитата: Bhudh от октября 23, 2014, 16:02Всё-таки, что-то здесь не то. Если поисковик всегда завышает результат в сто, тысячу, миллион раз (и при этом на последней странице всё-таки пишет честно), то это было бы слишком очевидным враньём и не в пользу самого поисковика.
Поэтому у меня давно настроен автоматический поиск с выдачей последней страницы.
Потому, что на первой странице что Гугла, что Яндекса число результатов придумали маркетологи: «Гляньте, какие мы крутые, столько нашли!».
А лохи верят.
Цитата: Тайльнемер от июля 9, 2015, 07:32Хотя, у гугла стоит ограничение на 1000 результатов, а выдаёт-то он всего 627 для 'girl'.
последняя недоступна.
Только 313 не «очень похожих» страницы с словом girl?!Страница создана за 0.027 сек. Запросов: 20.