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A comment on CAPTCHAs' Effect on Conversion Rates.

Re:CAPTCHAs' Effect on Conversion Rates by zaidf on Saturday July 18, 2009 @12:39AM (#711366) 

  After 3 months the CAPTCHA was switched 
  to the other CAPTCHA setting.
Wouldn't it be a better study if instead of doing the switch once after 3 months, captcha went on and off randomly per visitor throughout the 6 months? This would take away unintended effects on the study due to changes in traffic pattern over time.
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