Huge difference in my page views data

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Ritu Ahuja: Hi everyone. There is a huge difference in my page views data. In google adsense my views are comparatively double the pageviews in google analytics. I don't know which data should I consider and which data ad sites will consider? I will appreciate any help. Thanks. ;
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  Nebojsa Djukic: Hi Ritu, check if you have installed GA code on all pages of your website.
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  Ritu Ahuja: Thanks for your reply. How to check that +Nebojsa Djukic​. I have installed GA code in the layout of blogger. 
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  Nebojsa Djukic: +Ritu Ahuja ;Not sure how big your website is. If that's a small site you can choose randomly some pages, open them and take a view on the source (press CTRL + U). If you can't find analytics code in source of all of your pages then it's not properly installed.
  
  Easier way is to use a website such http://www.gachecker.com/ to check GA on your website.
  
  Perhaps you should install StatCounter or any other GA alternative just to compare results. ;
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  Ritu Ahuja: Thank you so much for your help. I appreciate it +Nebojsa Djukic​. I will check it out. Thanks again. :)
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  Rotimi Orimoloye (Orims): There are many things that corrupt Google Analytics data.
  So your Adsense data is what you need to "sell" to anyone who wishes to advertise on your site, because it is the data that the biggest online advertiser (A.K.A Google) is already using.
  
  This is just a theory.
  :)