How do you workout how strong a PR1 link is over a PR7 as in how many pr1s make up for a pr7, maybe keyword affects this but isn't there a rough estimation or something like a table of PR on the internet. Thanks.
No one knows the PR algorithm except Google. However its a popular understanding that, PR is calculated based on backlinks (Relevancy factor is also important indicator). PR 1 links wont give you PR7 . You would need literally tens of thousands of them. However some good PR8/Pr9 links can give you Pr7.