Originally Posted by Peter (IMC)

Experience tells us that we do know. Not the exact values, but even Google doesn't know what the exact values are because in their algorithms everything is relative. They don't compare to a set standard. Their algorithms are created in such a way that they compare to what's available online. Just like a human would do. Give a human 10 pages to order based on a keyword and he will put them in order from 1 to 10. Not place them in positions 4, 8, 28, 31, etc. which would happen if you'd compare to a set standard.

By experience you know that if you put the right keywords in the anchor text of menu links for example, you get more visits for those keywords. By experience you know that if you put keywords in titles.. you get more visitors for those keywords. By experience you know that when you put keywords in the content (text) you get more visitors for those keywords. By experience you know that that when you have more backlinks with the right anchor texts, you get more visitors for those keywords.

The really smart SEO's figured out that if you focus all those factors on the same keywords,.. you get really high positions.

The exact values are irrelevant.