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For ex: A keyword like 'e learning' throws up a count of 863 in overture but the count in wordtracker throws up a count of only 6. I dont see how this can happen since wordtracker updates databases once in 60 days and overture once a month...
I'm confused about which tool to trust. Please get back to me asap
If you are not using the US version of Overture you will get different results to Wordtracker i.e. if you choose your country in Overture before going to the Tools page.
Either way these figures are highly approximated, use extrapolation extensively, and are not to be relied on for anything. Use them as a rough guide, a very rough guide.
It would be interesting if somebody else could do those same tests and tell us what they are getting.
Similar thread: [webmasterworld.com...]
This believing Nielsen Netratings surely