Unusual right now

Every other page here tells you what a trade is worth today. This one tells you whether today is unusual — each item measured against its own last 90 days, not against a threshold that means different things for a rune and a godsword.

Item	Spread	Usually	Standing	Margin	Per window	In range	Activity	Days
Gold ring	-4.40%	3.97%	far below normal	-5	-54.9K	-57%	13.66×	91
Gold necklace	21.59%	4.14%	far above normal	17	193K	-56%	7.68×	91
Water battlestaffmembers	1.23%	0.34%	far above normal	-68	-7,956	-49%	1.74×	91
Uncut jademembers	110.00%	5.95%	far above normal	32	320K	-34%	3.63×	91
Raw swordfish	3.37%	2.13%	above normal	3	16.9K	-32%	1.70×	91
Magic longbowmembers	2.82%	1.34%	far above normal	8	7,760	-28%	1.90×	90
Diamond necklace	2.94%	0.76%	far above normal	15	8,805	-25%	9.12×	91
Sandwormsmembers	15.38%	2.86%	far above normal	12	96.0K	-24%	0.93×	91
Dragonstone boltsmembers	10.00%	1.56%	far above normal	31	79.5K	-21%	1.26×	91
Earth battlestaffmembers	1.12%	0.40%	far above normal	-76	-8,816	-20%	1.98×	91
Ancient essencemembers	15.38%	0.00%	far above normal	2	154K	-20%	2.16×	91
Grimy ranarr weedmembers	0.50%	0.46%	normal	-71	-14.8K	-19%	1.39×	91
Leaping salmonmembers	50.00%	0.00%	above normal	1	13.0K	-17%	4.25×	91
Manta raymembers	2.52%	2.29%	normal	5	5,040	-16%	2.87×	91
Uncut ruby	2.05%	1.56%	normal	1	1,282	-15%	1.83×	91
Yew longbow (u)members	13.01%	3.82%	far above normal	14	114K	-15%	2.46×	91
Toadflaxmembers	3.35%	0.62%	far above normal	24	13.0K	-15%	1.01×	91
Aether catalystmembers	5.62%	1.17%	far above normal	9	36.1K	-14%	1.65×	91
Snapdragon potion (unf)members	3.52%	0.40%	far above normal	99	14.6K	-13%	1.55×	91
Emerald ring	3.56%	2.85%	normal	7	15.6K	-13%	5.33×	91
Rope	-90.00%	11.29%	far below normal	-9	-2,250	-13%	5.89×	91
Sapphire ring	2.11%	2.24%	normal	1	3,521	-12%	11.83×	91
Prayer potion(3)members	2.12%	0.30%	far above normal	5	845	-12%	1.48×	90
Tarrominmembers	5.84%	4.70%	normal	6	43.8K	-12%	1.68×	91
Fish offcutsmembers	16.67%	25.00%	normal	1	8,000	-11%	3.26×	91
Emerald necklace	3.14%	2.53%	above normal	5	11.2K	-11%	1.54×	91
Ranarr potion (unf)members	0.63%	0.28%	above normal	-74	-13.7K	-11%	1.01×	90
Iron boltsmembers	90.00%	18.75%	far above normal	9	63.0K	-9%	2.78×	91
Amethystmembers	0.94%	1.10%	normal	-24	-10.7K	-9%	1.94×	91
Ranarr weedmembers	1.27%	0.18%	far above normal	-37	-7,326	-9%	1.19×	90
Ruby necklace	2.46%	1.75%	normal	4	4,676	-8%	2.94×	91
Dragonstone bolt tipsmembers	3.16%	1.75%	above normal	4	14.0K	-8%	1.18×	91
Grimy lantadymemembers	4.44%	1.77%	far above normal	18	24.2K	-8%	2.17×	91
Impling jarmembers	0.49%	3.38%	far below normal	-3	-14.6K	-7%	2.39×	91
Grimy toadflaxmembers	0.79%	0.99%	normal	-21	-11.9K	-7%	1.47×	91
Rune arrowmembers	3.13%	2.47%	normal	1	11.0K	-7%	2.20×	90
Grimy harralandermembers	4.67%	2.45%	above normal	4	26.7K	-6%	2.00×	91
Soft clay	4.40%	2.88%	normal	3	33.0K	-6%	0.61×	91
Soda ashmembers	633.33%	21.43%	far above normal	19	247K	-6%	11.00×	91
Dynamitemembers	-2.50%	2.25%	far below normal	-3	-37.5K	-6%	2.01×	91
Rubium splintersmembers	4.00%	2.88%	normal	2	26.7K	-6%	1.13×	91
Dragon javelin tipsmembers	-0.33%	2.17%	far below normal	-14	-22.8K	-6%	1.79×	91
Grimy snapdragonmembers	0.67%	0.46%	normal	-84	-13.3K	-5%	1.40×	90
Prayer potion(4)members	1.36%	1.00%	above normal	-54	-6,642	-5%	1.53×	90
Cadantinemembers	0.28%	0.26%	normal	-30	-17.0K	-5%	1.27×	91
Raw sharkmembers	3.67%	1.59%	far above normal	8	16.3K	-5%	1.44×	90
Sapphire necklace	4.27%	2.94%	above normal	7	24.9K	-4%	1.59×	91
Grimy cadantinemembers	5.20%	0.90%	far above normal	51	31.6K	-4%	1.61×	91
Gold ore	2.73%	1.96%	above normal	1	9,090	-4%	1.17×	90
Adamantite ore	0.75%	1.46%	below normal	-5	-12.5K	-4%	2.17×	90
Rune dart tipmembers	0.37%	2.59%	far below normal	-13	-15.9K	-4%	1.83×	91
Teak plankmembers	2.90%	1.96%	far above normal	6	8,694	-4%	1.35×	90
Lantadymemembers	2.42%	1.84%	normal	4	4,828	-3%	1.64×	91
Super restore(4)members	1.43%	1.09%	normal	-53	-5,883	-3%	2.03×	91
Zulrah's scalesmembers	0.80%	1.95%	far below normal	-1	-8,000	-2%	2.01×	90
Steam runemembers	19.40%	4.01%	far above normal	12	179K	-2%	1.55×	90
Raw monkfishmembers	5.81%	2.54%	far above normal	4	46.5K	-2%	1.86×	91
Crushed nestmembers	3.15%	0.71%	far above normal	37	11.1K	-2%	2.15×	91
Amethyst broad boltsmembers	7.91%	5.48%	above normal	8	57.6K	-2%	0.74×	91
Bird nest (empty)members	0.00%	0.24%	normal	-64	-20.0K	-2%	1.15×	91

How “unusual” is decided

Each item is compared with itself. A 4% spread is wide for a nature rune and narrow for a dragon warhammer, so a single threshold across the catalogue would surface the same volatile items forever and miss everything else.

Medians, not averages. One spike — an update, a streamer, a brief squeeze — drags an average around for weeks and makes everything after it look ordinary. The spread of the distribution is measured with median absolute deviation for the same reason.
At least 20 days or nothing. A percentile from four days is noise with a number attached. Items below the floor are left out rather than guessed at.
Unusual is not the same as worth doing. An item that normally has no spread sits at the 100th percentile the moment it has one of a single gp. So this list also requires a margin that survives the tax and a window worth filling.
Only items that actually trade. Restricted to 500+ an hour, because an unusual spread on something that changes hands twice a day is a trap rather than an opportunity.

Expect this to be empty much of the time. A market where something is always unusual is one with a badly set threshold.