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Search Engine
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82
Chapter 10
Now, let's see what happens if we link page A to page B.
Using our formula we get:
+ (
= .15
+ (
)) = 1
+ (
) = .15
You can see that by just linking page A to page B, we've changed the PR of page B from .15
all the way up to 1. Big difference!
With our newly calculated Page Ranks for all of our pages, let's do the calculation again. By
doing so, we'll slowly get to the "true page rank" of all of our pages... The more iterations we
do, the more gradual the change will be between each iteration.
+ (
) = .15
?
Page B: + (
)) = .2775
?
Page C: + (
) = .15
You can see that after another iteration of our formula, the PR of page B dropped
significantly... This number is closer to the actual Page Rank that Google would give page B.
Note: You can keep going through the formula and you'll notice that the change will be
smaller after each iteration...
* )
* (
*
*
0.15
* (
*
?
Page A:
?
Page B:
?
Page C:
?
Page A:
0.15
0.15
0.15
0.15
0.15
.85
0.85
.85
.85
0.85
.85
0
1/1
0
0
.15/1
0
A
(PR 1)
B
(PR 1)
C
(PR 1)


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