How are they collected? And listed (by frequency)? I can understand categorizing the most written words (still the actual book/articles/sites/whatever samples m

How are they collected? And listed (by frequency)? I can understand categorizing the most written words (still the actual book/articles/sites/whatever samples may skew the result sensibly) but most spoken? >This is a list of the 1,000 most commonly spoken Italian words. I can vouch that #974 "quarto di gallone" is actually one among the less common sentences ever spoken in Italian, more probably it is #25896746 in the real world, but it's still better than #541 "am" which is not Italian.