The difference between 3 keywords research tools: Keyword Discovery, WordTracker, and Overture.
1. OV one month, WT three and KD twelve months, and so the count figures would need some rationalisation
2. different data cleansing systems, eg., OV de-pluralises, de-punctuates and sometimes alphbetises the words in the search phrase, so again that muddies the correlation waters
The data from WT isn't very useful for infrequently-searched phrases.
OV data suffers from lots of automatic rank checking, which tends to happen in more competitive and frequently searched terms, so it's exponentially skewed at the top end. OV has recently forced stemming on certain searches, which makes it useless for assessing many phrases.
The Google External AdWords tool, another tool you should put into the mix, is skewed by the algorithms that Google is applying for AdWords buyers. It has the largest sample size, is the least likely to be skewed by test searches, and of course has demographics that come from Google.
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