Scaling by yesterday's ROAS and getting burned?
ROAS is backward-looking and volatile day to day. Scaling off one good ROAS day means you pour budget right as the ad regresses to the mean.
Scale on stability, not spikes:
— Use rolling 3-7 day CPA as your scale trigger, not single-day ROAS
— Only bump when the trend holds, not when one day pops
— Set a floor: if 7-day CPA breaks X, pause the ramp, don't push harder
One great day is luck. A held trend is signal.
Caveat: long purchase windows mean today's ROAS is undercounted anyway — wait for attribution to fill in. Pick your scale metric before you scale, not after.
Scale or Stall
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Scaling by yesterday's ROAS and getting burned?
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