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For a key phrase I was researching, adwords key tool was showing a global search volume of nearly 300,000 while Keyword Discovery was showing only 400 .
Any experienced member , please help me on which one is more accurate.
Google's tool has a much bigger and more reliable dataset, since Google have the biggest database of search keywords. If you're going to trust one tool, use the one with the biggest dataset.
That said, every keyword tool processes the numbers before they provide them to you, which means that for some cases, a smaller dataset with different processing could give you a more reliable answer - long tail searches, for instance.
One key problem with Google's tool is that it's designed to give advertisers an idea of how many eyeballs their ad is likely to get. So, it includes things like impression data on the content network which heavily bias generic keywords.
[edited by: jatar_k at 2:37 pm (utc) on Apr 29, 2010]
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...I am little confused between Google Adwords Keytool and Keyword Discovery Tool.
For a key phrase I was researching, adwords key tool was showing a global search volume of nearly 300,000 while Keyword Discovery was showing only 400.