KNOWLEDGE ADSENSE PROGRAM

CPC (Cost Per Click)
What it is: CPC or Cost Per Click refers to the maximum amount of money that an advertiser is willing to pay per click on their ads.
Importance: Higher CPC means higher EPC (Earnings Per Click) for you.
Source: Google Adwords
Clicks per month
What it is: These are the number of clicks the highest ad gets in a month in Google Adwords System.
Importance: There are many industries that exist online that don't get much clicks on their ads. Targeting such keywords might be harmful for your Adsense income. It shows you which keywords have a larger commercial traffic. More are the number of clicks, more effective a keyword is for adsense. Also, More clicks a keyword attracts, higher CTR you can expect for that keyword.
Source: Google Adwords
Advertisers
What it is: These are the number of Advertisers bidding on the keyword. This is the most important figure that you need while choosing keywords for Adsense.
Importance: There are many keywords in Google Adwords system that have high CPC like $50+ but no advertisers bidding on them. Obviously, no one is going to pay you like $15 or $50 if there are no advertisers bidding on a keyword. Also, more are the number of advertisers, more Affiliate programs you can find in that industry too.
Source: Google Adwords
Average CPC
What it is: Average CPC is the average of what all the advertisers bidding for the given keyword.
Importance: Average CPC adds to your power of judging high paying keywords. Where other tools end up giving you average of only top 3-8 bidders, KeywordCountry gives you average of what all the advertisers are paying on a keyword. This gives you the much more and astonishing picture of high paying keywords.
Source: Google Adwords and tedious calculations.
Competition
What it is: The actual number of pages that will be competing against you on a keyword. Inanchor Intitle formula used to determine this figure is regarded as the most precise formula ever devised to measure competition.
Importance: This column lets you find many more niche keywords. Generally the number of search results returned by Search Engines are taken as the number of pages competing on a keyword. But those pages who have used or just dumped your keyword in the corner of their page are not competing against you but SE will still list them. A true competitor targeting a webpage with a certain keyword, tends to include that keyword in the title and the anchor text that links to that webpage. And these are exact number of pages that are using these keywords in their Title text and Anchor Text.
Source: Google
Google Traffic Estimates
What it is: This is the estimated traffic that a given keyword is getting on Google Search Engine.
Importance: This data is far more accurate than Overture Search Estimates or WordTracker Search Estimates. More are the number of searches, more profitable a keyword is.
Source: Google and other sources (Estimated)
Overture Traffic Estimates
What it is: This refers to the number of searches done in a month for a particular keyword, according to the Overture PPC Engine. This helps you determine the keywords that attract more traffic.
Importance: More traffic means more profits. This column prevents you from wasting your time on keywords that are rarely searched in Search Engines.
Source: Overture
R/S Ratio
What it is: It is a ratio of Competition to Traffic. It’s an indicator of niche keywords.
Importance:Lesser the R/S Ratio, better will be the keyword is for building traffic. This formula again uses Inanchor Intitle formula to determine the competition which adds to its precision.
Source: Google and other sources (Calculated)
KEI Analysis
What it is: Keyword Effectiveness Index. It indicates the niche keywords too but is regarded better than R/S ratio. Try to the target keywords with high KEI
Importance: This figure also depends upon Inanchor Intitle formula for competition, which makes it more precise.
Source: Google and other sources (Calculated)
Ratings
What it is: KeywordCountry rates or gives stars to the keywords according to their profitability. More the stars you see, more profitable the keyword is for Adsense.
Importance: KeywordCountry rates the keywords according to the keywords and helps you bypass the keywords who have high CPC but are not profitable in real sense.
Source: Google Adwords