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I use Google Sitemaps, and it also appears that Google is visiting the sites with "Daily" or "Weekly" settings for <changefreq> more.
Moreover, it definitely appears that my websites that update more often are rising in SERPs faster and more consistently than those with mostly static pages..
Is there a correlation to Gbot visits and change frequency?
And is anyone else seeing sites with more fresh content faring better in rankings .. ?
In terms of ranking, there are times (like now) where it seems that brand new urls do amazingly well out of the box. It's possible that updated pages are also getting such a boost, but I haven't noticed that so far. Mostly, Google expects some kinds of pages to update frequently (home page of a newspaper), yet it seems that other types could actually get penalized for "playing around" too much (the actual news story after it's been published.) Google has a lot of data from which they can make such decisions.
I wouldn't want to start a rush for the "golden ring of ranking" by giving the impression that high <changefreq> settings or meaningless and frequent page changes are the secret key to better ranking.
If anyone wants to do a study on this, I'd be interested in the results. But I would also advise using disposable domains ;)