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Why might the estimated number of results change when going from page 1 to page 2?

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    Today's question comes from
    San Francisco, California.
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    Blind Five Year Old asks, "How reliable is the site colon,
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    query, and why does the total count sometimes change from
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    page one to page two?"
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    Well, I wouldn't really put it in terms of
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    the site colon query!
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    Instead, I would pivot and narrow and focus down on the
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    results estimates.
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    So there's a few things to know.
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    Number one, if you haven't noticed, you should notice
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    that results estimates are only accurate to about three
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    significant digits.
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    So they are estimates.
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    As we're looking for queries, at some point we say, OK, we
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    have enough to constitute the first page, and we see how far
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    we've gone through our posting list - the
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    amount of data we have--
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    therefore, we can estimate there's about this many
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    results left.
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    Now when you click from page one to page two, suddenly
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    you're going deeper.
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    And so you have a better estimate or you have a
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    slightly different estimate, because you're starting to
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    look not just a little bit of the way through all those
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    documents, you're actually starting to
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    go deeper and deeper.
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    So it's relatively common for our results estimates to
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    change going from page one to page two, typically becoming
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    more accurate.
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    So it's not usually a factor of the site colon query.
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    It's usually a factor of us digging deeper through our
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    data, and as a result, we have a better or at least a
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    different estimate for how many results there are.
Title:
Why might the estimated number of results change when going from page 1 to page 2?
Description:

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Video Language:
English
Team:
Google Webmasters
Projekt:
WebmasterHelp
Duration:
01:22

English, British subtitles

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