Alexa Discussion Thread - Page Ranks

Discussion in 'All Other Search Engines' started by Syfonic, Apr 23, 2008.

  1. #1
    There are currently 2,018 topics with Alexa in the title of them and there are over 5000 topics with it in the text. Let's just use this thread for the discussion of Page Ranks with Alexa to keep so many new topics from popping up.

    About the Alexa Traffic Rankings
    A listing of all sites on the Web, sorted by traffic...

    Alexa computes traffic rankings by analyzing the Web usage of millions of Alexa Toolbar users and data obtained from other, diverse traffic data sources. The information is sorted, sifted, anonymized, counted, and computed, until, finally, we get the traffic rankings shown in the Alexa service. The process is relatively complex, but if you have a need to know, please read on.

    What is Traffic Rank?

    The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and data obtained from other, diverse traffic data sources, and is a combined measure of page views and users (reach). As a first step, Alexa computes the reach and number of page views for all sites on the Web on a daily basis. The main Alexa traffic rank is based on a value derived from these two quantities averaged over time (so that the rank of a site reflects both the number of users who visit that site as well as the number of pages on the site viewed by those users). The three-month change is determined by comparing the site's current rank with its rank from three months ago. For example, on July 1, the three-month change would show the difference between the rank based on traffic during the first quarter of the year and the rank based on traffic during the second quarter.

    What are sites and Web hosts?

    Traffic is computed for sites, which are typically defined at the domain level. For example, the Web hosts www.msn.com, carpoint.msn.com and slate.msn.com are all treated as part of the same site, because they all reside on the same domain, msn.com. An exception is blogs or personal home pages, which are treated separately if they can be automatically identified as such from the URLs in question. Also, sites which are found to be serving the same content (mirrors) are generally counted together as the same site.

    What is Reach?

    Reach measures the number of users. Reach is typically expressed as the percentage of all Internet users who visit a given site. So, for example, if a site like yahoo.com has a reach of 28%, this means that of all global Internet users measured by Alexa, 28% of them visit yahoo.com. Alexa's one-week and three-month average reach are measures of daily reach, averaged over the specified time period. The three-month change is determined by comparing a site's current reach with its values from three months ago.

    What are Page Views?

    Page views measure the number of pages viewed by site visitors. Multiple page views of the same page made by the same user on the same day are counted only once. The page views per user numbers are the average numbers of unique pages viewed per user per day by the visitors to the site. The three-month change is determined by comparing a site's current page view numbers with those from three months ago.

    How Are Traffic Trend Graphs Calculated?

    The Trend graph shows you a three-day moving average of the site's daily traffic rank, charted over time. The daily traffic rank reflects the traffic to the site based on data for a single day. In contrast, the main traffic rank shown in the Alexa Toolbar and elsewhere in the service is calculated from three months of aggregate traffic data.

    Daily traffic rankings will sometimes benefit sites with sporadically high traffic, while the three-month traffic ranking benefits sites with consistent traffic over time. Since we feel that consistent traffic is a better indication of a site's value, we've chosen to use the three-month traffic rank to represent the site's overall popularity. We use the daily traffic rank in the Trend graphs because it allows you to see short-term fluctuations in traffic much more clearly.

    It is possible for a site's three-month traffic rank to be higher than any single daily rank shown in the Trend graph. On any given day there may be many sites that temporarily shoot up in the rankings. But if a site has consistent traffic performance, it may end up with the best ranking when the traffic data are aggregated into the three-month average. A good analogy is a four-day golf tournament: if a different player comes in first at each match, but you come in second at all four matches, you can end up winning the tournament.

    What is Data Normalization?

    Alexa's ranking methodology corrects for a large number of potential biases and calculates the ranks accordingly. We normalize based on the geographic location of site visitors. We correct for biases in the demographic distribution of site visitors. We correct for potential biases in the data collected from our Alexa Toolbar to better represent those types of site visitors who might not use an Alexa Toolbar.

    How are Movers & Shakers Calculated?

    The movers and shakers list is based on changes in average reach (numbers of users). For each site on the net, we compute the average weekly reach and compare it with the average reach during previous weeks. The more significant the change, the higher the site will be on the list. The percent change shown on the Movers & Shakers list is based on the change in reach. It is important to note that the traffic rankings shown on the Movers & Shakers page are weekly traffic rankings; they are not the same as the three-month average traffic rankings shown in the other Alexa services and are not the same as the reach numbers used to generate the list.

    Some Important Disclaimers

    The traffic data are based on the set of toolbars that use Alexa data, which may not be a representative sample of the global Internet population. To the extent that our sample of users differs from the set of all Internet users, our traffic estimates may over- or under-estimate the actual traffic to any particular site.

    In some cases traffic data may also be adversely affected by our "site" definitions. With tens of millions of hosts on the Internet, our automated procedures for determining which hosts are serving the "same" content may be incorrect and/or out-of-date. Similarly, the determinations of domains and home pages may not always be accurate.

    Sites with relatively low traffic will not be accurately ranked by Alexa. Alexa's data comes from a large sample of several million Alexa Toolbar users and other traffic data sources; however, the size of the Web and concentration of users on the most popular sites make it difficult to accurately determine the ranking of sites with fewer than 1,000 monthly visitors. Generally, traffic rankings of 100,000 and above should be regarded as not reliable. Conversely, the closer a site gets to #1, the more reliable its traffic ranking becomes.
     
    Syfonic, Apr 23, 2008 IP
  2. wissam

    wissam Well-Known Member

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    #2
    Thanks for the info, what a spammy nice signature you have by the way.
     
    wissam, Apr 23, 2008 IP
  3. mikelaw

    mikelaw Peon

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    #3
    Lots of good info. Thanks
     
    mikelaw, Apr 24, 2008 IP
  4. simstar

    simstar Peon

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    #4
    I thought that the methods for ranking by alexa had changed in the last week, so this information is now out of date?
    I may be mistaken but thats what I read.
     
    simstar, Apr 24, 2008 IP
  5. teampower

    teampower Well-Known Member

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    #5
    where did you got this info from copy and paste?
     
    teampower, Apr 24, 2008 IP
  6. DJMC

    DJMC Peon

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    #6
    Doesn't add to what we don't already know!
     
    DJMC, Apr 24, 2008 IP
  7. xuehuxue

    xuehuxue Peon

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    #7
    Lots of good info. Thanks
     
    xuehuxue, Apr 25, 2008 IP
  8. Syfonic

    Syfonic Peon

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    #8
    This information was taken from the Alexa website after the change.
     
    Syfonic, Apr 30, 2008 IP
  9. psuser

    psuser Active Member

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    #9
    Anyway thank for this info
     
    psuser, Oct 30, 2008 IP
  10. uresearch

    uresearch Peon

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    #10
    great info - thanks for taking the time to elaborate
     
    uresearch, Oct 30, 2008 IP
  11. kidtechguru

    kidtechguru Active Member

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    #11
    Nice explanation of the alexa rank...
     
    kidtechguru, Oct 30, 2008 IP
  12. I-G4L

    I-G4L Peon

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    #12
    This is back from April

    Don't come spamming it people......
     
    I-G4L, Oct 30, 2008 IP
  13. AGamer

    AGamer Banned

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    #13
    How can it be that my website went from 4mil alexa to 400k in 2 months and my traffic is about 100 unique a day.

    It's a gaming news website. Alexa 0
     
    AGamer, Dec 13, 2008 IP
  14. bille

    bille Peon

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    #14
    Because Alexa's ranking system is terribly unscientific :) See the article in my signature...
     
    bille, Dec 13, 2008 IP
  15. gooblogle

    gooblogle Active Member

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    #15
    Nice thank you!
     
    gooblogle, Apr 15, 2009 IP
  16. ETFAffiliate

    ETFAffiliate Guest

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    #16
    Thanks for the info.
     
    ETFAffiliate, Apr 15, 2009 IP
  17. buidam

    buidam Peon

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    #17
    [​IMG][​IMG][​IMG][​IMG] it is hard to get rank <1 milion with alexa
     
    buidam, Apr 19, 2009 IP
  18. harshav

    harshav Banned

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    #18
    thanks for sharing info dudes..
     
    harshav, Apr 19, 2009 IP
  19. BUSA

    BUSA Peon

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    #19
    Alexa is one of the biggest BS companies. There is no sense of accuracy and you want better rank just slap on the toolbar, sad but true.

    Anyways its owned by Amazon and we can't do much since all advertisers give it too much heed.
     
    BUSA, Apr 20, 2009 IP
  20. indianh

    indianh Peon

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    #20
    my site`s rank became 1 million from 3 million in span of 30 days, with not many users increased !
    i heard whole world internet traffic is reduced, so is it possible because of this reason my site`s rank went up ?
     
    indianh, Apr 24, 2009 IP