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Accuracy

How accurate is the Quirkies model?

Every score comes from the newest chronological hold-out; the target sale is excluded from training, comparables, and its causal floor proxy.

Median accuracy (100−APE)
93.0%
Mean accuracy (100−APE)
90.3%
Within ±5%
36%
Within ±10%
67%
Within ±20%
90%
Bias
-1.3%

Accuracy by market tier

Floor, middle-market, and grail sales are scored separately so aggregate accuracy cannot hide a weak segment

TierSalesMedian accuracyWithin ±10%Bias
floor116193.1%68%-1.1%
middle1559.2%0%-18.2%
grail131.6%0%-68.4%

Weekly median accuracy

Chronological hold-out accuracy by sale week

Error distribution

Signed hold-out error; positive means over-predicted

Scored hold-out sales

60 out-of-sample predictions frozen at evaluation time

ItemTier / evidenceDateSaleModelErrorAccuracy
#706floor · highSep 18, 20261.044Ξ1.096Ξ+5.0%95.0%
#394floor · mediumSep 18, 20261.040Ξ1.021Ξ-1.8%98.2%
#3553floor · mediumSep 18, 20261.040Ξ1.003Ξ-3.6%96.4%
#623floor · highSep 18, 20261.040Ξ0.952Ξ-8.5%91.5%
#623floor · highSep 16, 20260.905Ξ1.020Ξ+12.7%87.3%
#1823floor · highSep 16, 20260.980Ξ1.096Ξ+11.8%88.2%
#4746floor · highSep 15, 20261.042Ξ1.062Ξ+1.9%98.1%
#837floor · highSep 15, 20261.300Ξ1.167Ξ-10.2%89.8%
#2387floor · highSep 14, 20261.298Ξ1.261Ξ-2.9%97.2%
#3985floor · mediumSep 13, 20260.911Ξ1.059Ξ+16.3%83.8%
#3669floor · highSep 10, 20261.066Ξ1.030Ξ-3.4%96.6%
#2134floor · highSep 10, 20261.066Ξ0.982Ξ-7.9%92.1%
#282floor · mediumSep 10, 20261.087Ξ0.966Ξ-11.1%88.9%
#1839floor · highSep 10, 20261.075Ξ1.073Ξ-0.2%99.8%
#1911floor · mediumSep 9, 20261.069Ξ0.980Ξ-8.3%91.7%
#501floor · highSep 9, 20261.030Ξ0.942Ξ-8.5%91.5%
#1234floor · highSep 9, 20261.030Ξ0.941Ξ-8.6%91.4%
#3915floor · highSep 9, 20260.990Ξ1.029Ξ+3.9%96.1%
#153floor · highSep 8, 20261.200Ξ1.147Ξ-4.4%95.6%
#4444floor · highSep 8, 20261.000Ξ1.019Ξ+1.9%98.1%
#4041floor · highSep 8, 20261.000Ξ0.991Ξ-0.9%99.1%
#4287floor · mediumSep 8, 20260.990Ξ0.990Ξ0.0%100.0%
#1234floor · highSep 7, 20260.890Ξ0.997Ξ+12.0%88.0%
#4273floor · highSep 5, 20261.060Ξ0.979Ξ-7.6%92.4%
#2694floor · mediumSep 5, 20261.051Ξ0.955Ξ-9.1%90.9%
#31floor · highSep 5, 20261.050Ξ0.965Ξ-8.1%91.9%
#3487floor · mediumSep 5, 20261.050Ξ0.978Ξ-6.9%93.1%
#277floor · highSep 5, 20261.050Ξ0.958Ξ-8.8%91.2%
#3183floor · highSep 5, 20261.050Ξ0.989Ξ-5.8%94.2%
#4239floor · mediumSep 5, 20261.040Ξ0.975Ξ-6.3%93.8%
#3686floor · highSep 5, 20261.000Ξ0.903Ξ-9.7%90.3%
#2187floor · mediumSep 5, 20261.040Ξ0.960Ξ-7.7%92.3%
#480floor · highSep 5, 20261.000Ξ0.970Ξ-3.0%97.0%
#945floor · mediumSep 5, 20261.046Ξ0.964Ξ-7.8%92.2%
#501floor · mediumSep 4, 20260.850Ξ0.982Ξ+15.5%84.5%
#3686floor · mediumSep 4, 20260.850Ξ0.962Ξ+13.2%86.8%
#3471floor · highSep 4, 20261.002Ξ0.892Ξ-11.0%89.0%
#316floor · highSep 4, 20261.030Ξ0.969Ξ-5.9%94.1%
#3851floor · mediumSep 4, 20261.002Ξ0.927Ξ-7.5%92.5%
#4164floor · highSep 4, 20261.047Ξ0.966Ξ-7.7%92.3%

Model quirkies-1787518199-2026-08-03.2 · evaluated through 8/23/2026. Method details on the methodology page.