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Step 1. - DON'T PANIC! Step 2. - Understand that Moz's DA & PA can take a little while to find that you've set a canonical and or 301. Further to this understand that Moz is attempting to give you an indicator to what is an authority (a good link etc.) this is not an absolute nor is it a garuntee of ranking. Step 3. - Relax, have some of your favorite beverage. Humor aside as long as you've implemented the 301 correctly the rest will take affect it can just take a little time for Roger bot to find your changes, rest assured I'm sure Google has found your changes and given the link juice the right treatment. On top of this links pointed to www. and none www. is still a perfectly natural portfolio. Short answer: If I build backlink to the non-www version, will it increase the PA of the www version since it's has a 301 redirect ? Yes, well technically it would increase DA for the none-www in a more exact way. If I build backlink to the non-www version, will it increase the PA of the www version since it's has a 301 redirect ? see above answer , id recommend you build links to the main version you are going to use (www.) But how can I increase my DA if I focus on building backlink to the www version of my website ? Build links to the www. and any none www. will be taken care of by the 301 So i would like to have some clarifications about how their domain authority and page authority system work. My PA of the www version is higher than my DA because almost all my link point to the www version and I do the 301 redirect. ? PA is base on the links going to that page DA is based on all the links going to that domain across all the pages. The reason you may have a higher DA - PA is that page is stronger value than the domain, try not to over think this! Hope that helps, and remember - DONT PANIC!

Hi Vasily, You've received some great feedback here from the community and nice of fellow Canadian Jim Rudnick for letting us know he hasn't seen 7-packs in months. I digress here, but in the US, I am still not only seeing 7-packs for dental searches but am also seeing major directories outrank them organically. Ah - the fun of Local SEO! Basically, I agree with what Brady has written. With their 3 or 7-pack display ranking up top, they are showing you what they think is best for customers and best for Google. Getting this to change is unlikely, though a major algo change on Google's part in 2015 could, of course, throw all of this out the window For now, your best bet is to be able to achieve consistently good visibility in the packs-n-stacks in your area.