CPA Z-Score — Last 60 Days
Spend-weighted panel
·
Hybrid threshold: rolling median + anchored MAD
·
Jan 22 – Mar 22, 2026
n = 43–47 businesses
k
bad
= 3.0σ k
vbad
= 4.5σ
Mar 16
Mon
VERY BAD
Mar 17
Tue
NORMAL
Mar 18
Wed
NORMAL
Mar 19
Thu
VERY BAD
Mar 20
Fri
NORMAL
Mar 21
Sat
NORMAL
Latest
Mar 22
Sun
BAD
Normal
Bad
Very Bad
BAD threshold
VERY BAD threshold
↑
Higher is worse — elevated score means the panel is paying more per conversion than its historical baseline
Hover a point to see details