3.4.5

PageRank Algorithm

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PageRank Algorithm

The PageRank algorithm is a method of ranking the web pages in a set of Google search results.

PageRank algorithm

PageRank algorithm

  • PageRank is named after Larry Page who, along with fellow Stanford University student Sergey Brin, developed the algorithm in the mid-1990s.
    • The algorithm judges how important each web page is.
  • The higher the score for a particular page, the closer to the top of the list of results it appears.
Operation

Operation

  • Google searches often contain millions of results, so PageRank is an important method of ensuring useful pages are more prominent in the list.
  • The algorithm has to be run constantly for each web page as the number of external links to the page can change at any time.
Algorithm

Algorithm

  • The PageRank algorithm is written as follows:
    • PR(A)=(1−d)+d(PR(T1)C(T1)+...+PR(Tn)C(Tn))PR(A) = (1-d) + d \left(\frac{PR(T_1)}{C(T_1)} + ... + \frac{PR(T_n)}{C(T_n)}\right)
  • Using ‘Web page A’ as an example:
    • PR(A)PR(A) is to the PageRank of ‘Web page A’.
    • PR(Ti)PR(T_i) is the PageRank of any of nn pages which link to ‘Web page A’.
    • C(Ti)C(T_i) is the number of outbound links on the pages which link to ‘Web page A’.
    • dd is the damping factor, which is usually set to 0.85.
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Components of a Computer

1.1

Structure & Function of the Processor

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1.2

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Input, Output & Storage

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Systems Software

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Applications Generation

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Software Development

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Types of Programming Language

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3

Exchanging Data

3.1

Compression, Encryption & Hashing

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Databases

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Networks

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3.4

Web Technologies

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4

Data Types, Data Structures & Algorithms

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Data Types

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4.2

Data Structures

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4.3

Boolean Algebra

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5

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5.1

Computing Related Legislation

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5.2

Moral & Ethical Issues

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6

Elements of Computational Thinking

6.1

Thinking Abstractly

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6.2

Thinking Ahead

6.2.1Inputs & Outputs
6.3

Thinking Procedurally

6.3.1Decomposition
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Thinking Logically

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Thinking Concurrently

6.5.1Concurrent Processing
7

Problem Solving & Programming

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Programming Techniques

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Programming Construction

7.2.1Integrated Development Environments7.2.2The Purpose of Testing7.2.3Types of Testing7.2.4Test Plans
8

Algorithms

8.1

Algorithms

8.1.1Interpreting Algorithms8.1.2Correcting Algorithms8.1.3Completing Algorithms8.1.4Sort Algorithms8.1.5Bubble Sort8.1.6Insertion Sort8.1.7Merge Sort8.1.8Search Algorithms8.1.9Linear Search8.1.10Binary Search8.1.11Quick Sort Algorithm8.1.12A* Algorithm

Practice questions on PageRank Algorithm

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  1. 1
    What order of magnitude of results do most google searches return?Multiple choice
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Search Engine Indexing

Server & Client-Side Processing