I see here http://www.alexa.com/siteinfo/google.com in section How engaged are visitors to google.com? exsist 3 parameter: Bounce RateDaily Pageviews per VisitorDaily Time on SiteDaily Pageviews per Visitor = how much pages user open e.g. can open 3 page from domain.com or can leave page without open any new page.Daily Time on Site = this mean how much time people spend on website.My question, bounce rate is maked from this 2 parameter and depends of this 2 parameter or bounce rate is separately calculated by some other parameter?
What exactly is bounce rate on the site info from Alexa?
alexa;bounce rate;page views
The direct answer to the Bounce rate concept has been answered before, here.From Google Analytics Help Center:Bounce rate is the percentage of single-page visits or visits in which  the person left your site from the entrance (landing) page.There are a number of factors that contribute to a high bounce rate. For example, users might leave your site from the entrance page if there are site design or usability issues. Alternatively, users might also leave the site after viewing a single page if they've found the information they need on that one page, and had no need or interest in going to other pages.In reply to your question, yes, it's calculated separately because in fact it has nothing to do with those 2 other metrics you point: it's just an independent percentage of how many users arrive and leave your site without seeing more than one page.The time a user stays doesn't matter, a user can open your page and allow the session to timeout (30min by GA default) and will still be counted as a Bounce if he only sees one page.