There are few things by which you can judge the quality of a link some examples like there should be less out bound links on the page , c class ip should be unique , the page should be cached by Google , subject relevancy etc there are many other examples which you can know from any seo consultant or a off page optimizer.
It seems like relevant language and the language used in the hyperlink are super important. Maybe more than just page rank. Anyone disagree?
What the F*** u think of yourself? U r not allowed to show ur mental disability here in DP. We know u need some time. Mind before you say anything bad cz it can return to you back. If you can't help others, just dont be part to spoil the information given.....
I would say page relevancy first (page content and title for example), then PR and age (authority and trust), actual anchor text, with less outbound links as possible... Do-follow of course... While acquiring those kinds of links isn't easy, there are several ways but first you need good writing skills (are you thinking about guest posting? I am...) and your site needs to be really good/relevant in the first place (your offer might easily be rejected, let's say that your website quality dictates the quality of links you are able to acquire). IMO...
If it the link come from a high pr site with very few links then it is invaluable. A link with a pr0 and almost no other obl could be very valuable as well.
in order of the importance 1. domain authority: links from high authority domains like wikipedia can boost your site quite a lot 2. relevancy: kw in url, title, content 3. anchor test 4. page rank
There are lots of the things which helps us to understand the quality of the link like.... 1- Age of the domain 2- PR of the web pages 3- Incoming and outgoing links for the web pages 4- Authoritative view for the website 5- Content of the web page etc 5-
I think the most important thing is; the anchor text, if your site is about "How to burn fat" and a site with high PR links to you with anchor text "Grease Monkey" that link will definitely do you no good at all.
If it comes from a relevant site to your niche, its pretty good quality also if its in the actual content of the page or in the footer matters.
Google's algorithm is too sophisticated to be able to 'judge the quality' of a link. In simple terms.. a link is a link is a link.. By this I mean that there are so many factors such as PR of page linking, whether it has even been cached, number of outbound links on page etc that to rank you need a mixture of all types of links. This is what will appear natural to google so don't discredit any links. A consistent mixture of links.. and consistency is the key.. will move you up the ranking guaranteed.
ngonnella was correct, no matter a link is whether dofollow or nofollow it still a link that affects our website rankings as it more looks natural in search engines, though also important if its related to the topic.