If you want to link to somebody but you don’t want it to count as a vote (you don’t want to pass link-juice), or you support user-generated content and want to deter spammers, you can use a nofollow link. Google says it discounts the value of those links. I’m not convinced they discount them heavily, but other SEOs are so they seem to deter spammers if nothing else. Data analysis works in concert with the creative elements to aid the practitioner in navigating the decision-making process. High Flesch-Kincaid readability score (readability) - If your content needs a Literature major to be deciphered, then you're probably not going to get a lot of links. Why? Because if they don't understand it, they have no reason to link to it. DA/PA and CT/TF are all third party metrics meant to somehow replace the void left by the famous Google PR (Page Rank). Obviously none of them could replicate PR real values of nowadays (as those values are being kept secret for quite a while now). Every copy that exists will be penalized and Panda will chew you up like bamboo stalks.