How many impressions are needed for a "scientific" PPC test

Discussion in 'Pay Per Click Advertising' started by Pavlovapete, Feb 27, 2006.

  1. #1
    Hi all,

    I'm wanting to try out PPC - but I am unsure how many impressions I need in a test before I can say the ad works or doesn't - how many would you suggest?

    I'd be targeting a 1% CTR initially.

    100 impressions - 300 - 1000 - more?

    I'd like my tests to have some statistical validity so I could use the results to make PPC investment decisions.

    Thanks in advance for any advice

    Cheers
     
    Pavlovapete, Feb 27, 2006 IP