What is Keyword Prominence ?
Prominence is the ratio of the position of one word or phrase to the positons of the other words in a text.
The formula we use at Ranks NL isprominence = ($totalwords - (($positionsum - 1) / $positionsnum)) * (100 / $totalwords)
Where
$totalwords = total number of words in string
$positionsum = the sum of each position of the word we are analyzing
(example: if a word occurs on position 2 and 5 $positionsum is 7)
$positionsnum = The number of positions
The prominence of one word in the first position, in a ten word sentence having unique words only is
(10 - ((1 - 1) / 1)) * (100 / 10)) = 100%.
If that same word would be the last word in the sentence, it's prominence would be
(10 - ((10 - 1) / 1)) * (100 / 10)) = 10%.
If that same word would occur twice, on position 1 and 10, it's prominence would be
(10 - ((11 - 1) / 2)) * (100 / 10)) = 50%