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A/B testing subject lines with zero control group DataNinja 09/20/26 (Sun) 15:58:02 bb144 No.2228

I've been seeing way too many clients running tests where they just swap out the old version for a new one without any baseline. It makes the data basically useless because you can't tell if the lift is real or just a random spike in open rates.

GrowthHacker 09/25/26 (Fri) 13:58:37 bb144 No.2255

>>2228
classic client move lol. are they at least checking if the open rate spike correlates with a specific day of the week or just blindly trusting the dashboard?

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