How is Page Rank Calculated?
Search Engine Optimization - 17 Comments » - Posted on 十月, 2 at 4:43 上午
It’s important to understand the difference between real page rank and tool bar page rank.
- Toolbar page rank (TBPR) can be tracked using the Google toolbar. Toolbar page rank shows results which are several months old. TBPR numbers (from 0 to 10) are heavily inflated, since real PR numbers are not linear. For instance, a page with a PR 8 would logically have twice as much PR as a page with PR 4. In reality its page rank is usually several times more.
- Real page rank is a number we can only guess, since Google is a black box when it comes to disclosure. Imagine a rising slope, which increases until it reaches a vertical position.
Toolbar page rank is calculated using ranges of real page rank. For example, imagine that the maximum Google PR value is 1,000,000. Toolbar PR 1 equals a range of 1 – 10. Toolbar PR 2 equals a range of 10 – 50. Toolbar PR 3 equals a range of 50 to 1000. Toolbar PR 4 equals a range of 1000 – 10,000 and so on, until finally toolbar PR 9 ranges from 600,000 – 1,000,000.
As you can see, going from one to two on toolbar PR is far easier than reaching 6 or 7, as the actual numeric values for those ranks are 100 times higher.
If you ever played any role playing games (such as World of Warcraft), you will know that the earliest levels are easiest to reach. As you progress to the upper levels, it gets harder and harder to go up a level, because the overall score requirement goes up as well.
| Level | Score Required To Obtain the Level |
| 01-10 | 500 |
| 11-20 | 1,000 |
| 21-30 | 2,500 |
| 31-40 | 4,000 |
| 41-50 | 6,000 |
| 51-60 | 9,000 |
| 61-70 | 13,000 |
| 71-80 | 23,000 |
| 81-90 | 43,000 |
| 91-99 | 83,000 |
As you can in the example from America’s Army, level requirements go up as you progress. Toolbar page rank relates to real page rank in a similar way. On the toolbar, two pages may have a rank of 8, but their real Page Rank (score) is different; a page with a higher real PR number will win on search results.
Also, keep in mind that toolbar PR is updated every few months, while real page rank is constantly renewed and recalculated, making toolbar page rank sort of a “snapshot.”
Posted in Search Engine Optimization | 17 Comments »
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