Page Rank

Calculation

The PageRank formula refines itself over time, considering current page scores.

Factors

• In-bound links
  • Main factor, most effectual in PageRank
• Frequency and magnitude of updates
• Metadata and page elements
  • Keywords (metadata)
  • Descriptions (metadata)
  • H1 (elements)
• Domain name
• Site security (SSL certificate)
• Page load times

Formula

Info

This does not need to be remembered.

$$PR(A)=(1-d)+d(PR(Ti)/C(Ti)+...+PR(Tn)/C(Tn)))$$

PageRank score defaults to 1.

d - damping factor; prevents websites from getting an extreme score (< 1).

Typically 0.85.

C(page) = outbound links
Ti = first page
Tn = other page

Simple Example

Transclude of PageRank---Simple-Example.excalidraw

Initial Page A Calculation

$$PR(A)=(1-0.85)+0.85(1/1)=1.0$$

Initial Page B Calculation

$$PR(B)=(1-0.85)+0.85(1.0/1)=1.0$$

Page A Re-calculation

$$PR(A)=(1-0.85)+0.85(1.0/1)=1.0$$