Domain Authority

[SammyT]

Recently when doing my usual research that I do weekly I noticed a drastic drop in my domain authority. How or why does this happen and how can I fix it?

http://www.brick-anew.com/

Thanks

[OlegKorneitchouk]

You can read about DA/PA fluctuations in the 2nd August Mozscape update post

http://www.seomoz.org/blog/two-mozscape-updates-in-august-and-more-info-on-why-pada-fluctuate

Why do Domain Authority & Page Authority Fluctuate?

Every index, we get a lot of questions about why a site's/page's PA/DA goes up or down. The answer's not easy because the inputs vary quite a bit, but basically, four things can cause change in these metrics from index to index:

1. The site/page received more or fewer links or more/fewer more/less powerful links. Your site's link profile may even remain completely unchanged and still see fluctuation in DA/PA because the sites pointing to you have been recalculated to have better or worse metrics.
2. Google changed things in their ranking algorithm and thus our models for DA/PA, which measure and attempt to track to correlation with Google's rankings changed, too.
3. The web's link graph changed, and what was "0" (the lowest possible score) is now lower/higher than before and/or what was "100" (the highest possibly score) is now higher/lower than before. Essentially, think of this as the goalposts moving because the field's gotten bigger or smaller.
4. Our web index changed in size/structure as we toss our more spam/junk and crawl more/fewer webpages, potentially biasing against links we were counting or hadn't counted in prior indices.

[SEODinosaur]

This happend because SEOmoz has made some updates to its index...

Read here: http://www.seomoz.org/blog/two-mozscape-updates-in-august-and-more-info-on-why-pada-fluctuate