MozCast.com - What happened on the 27th? Hottest day of the month!

[activitysuper]

MozCast.com - What happened on the 27th? Hottest day of the month!

Anyone got any idea of what changed in the Algo on this day?

Cheers.

[BethA]

I noticed a big drop on the 30th for our site, which I've asked in a question here: http://www.seomoz.org/q/google-algorithm-update-july-30-2012-anyone-else-notice-a-major-drop-in-keyword-rankings

My guess is that it's another Panda iteration combined with the Venice local update, allowing the same site, different pages to rank multiple times for the same keyword(s). But at this point I'm not sure.

A few of my pages have rebounded a few spots but have not gained any where near there original positions (most went from page 1 to page 3-4 of SERPs).

Glad to see it's not a completely isolated incident.

[Dr-Pete]

Unfortunately, we're not sure yet. We've had some strange data discrepancies in the past week. Long story short, there are two weather "stations" (A and B) - they usually run very closely in sync, but they've diverged the past few days, peaking on different days.

At first glance, it seems like Panda 3.9 rolled out over multiple days, like Panda 3.7 did, and may have masked some other updates. Oddly, the official roll-out day of Panda 3.9 was one of the lowest-flux days in that group. A similar pattern has happened three times in the past two months, and it's unclear why. Some updates, like Penguin 1.0, seem to be one-day, single-shot events. Others get released and adjusted over a few days.

We'll be trying to provide more analysis going forward on the MozCast Twitter feed (@mozcast) and possibly here on the blog for major events. Happy to field questions here as well, though.

[BethA]

Thanks as always for the help Dr. Pete, much appreciated!  Seems like there's a lot going on with the algo at the moment, guess we're all just along for the ride.  Thanks for mentioning the MozCast tool (http://mozcast.com), very interesting and a great graphic to help me know I'm not crazy haha, and a long needed tool overall; I look forward to seeing the added functionality you guys incorporate in the future.

People seem to be experiencing similar issues in my thread (http://www.seomoz.org/q/google-algorithm-update-july-30-2012-anyone-else-notice-a-major-drop-in-keyword-rankings), so I referred them here.

If you guys get a handle on what the flux is all about, please let me know or better yet blog it to the Moz faithful. Thanks again Dr. Pete.

-Marty

Each day, we take the current top 10 and compare it to the previous day's top 10 (for any given keyword), and calculate a rate of change or "delta".

[Dr-Pete]

My short-term goal is to provide some at-a-glance drill-down metrics (like domain diversity or EMD influence) on the Mozcast site. That way, when something happens, people can immediately  look at half a dozen metrics and see if there's a pattern across the data as a whole. No ETA on that yet, but hopefully within a few weeks.