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
Copper ore	3.70%	0.00%	normal	1	13.0K	100%	69.22×	91
Garlic	7.69%	9.52%	normal	2	22.0K	81%	25.43×	91
Archery ticketmembers	60.00%	15.38%	above normal	6	108K	0%	16.01×	87
Silk	-7.14%	14.29%	far below normal	-1	-18.0K	24%	13.86×	91
Gold ring	-4.40%	3.97%	far below normal	-5	-54.9K	-57%	13.66×	91
Sapphire ring	2.11%	2.24%	normal	1	3,521	-12%	11.83×	91
Soda ashmembers	633.33%	21.43%	far above normal	19	247K	-6%	11.00×	91
Beer	5.26%	6.82%	normal	2	4,000	47%	10.00×	91
Diamond necklace	2.94%	0.76%	far above normal	15	8,805	-25%	9.12×	91
Raw sardine	2.50%	7.41%	below normal	1	15.0K	100%	8.34×	91
Ruby ring	1.70%	2.24%	normal	-2	-2,424	3%	8.14×	91
Gold necklace	21.59%	4.14%	far above normal	17	193K	-56%	7.68×	91
Diamond bolt tipsmembers	3.73%	1.20%	far above normal	3	18.6K	81%	7.35×	90
Cabbage	3.45%	3.03%	normal	1	6,000	62%	7.21×	91
Dragon knife(p++)members	3.88%	3.31%	normal	59	18.0K	4%	7.10×	91
Maple shortbow	-8.46%	4.19%	far below normal	-13	-100.0K	34%	7.04×	91
Nihil dustmembers	3.34%	4.44%	normal	37	12.9K	68%	6.77×	91
Pot	25.00%	9.09%	above normal	3	39.0K	23%	6.16×	91
Leaping sturgeonmembers	40.00%	0.00%	above normal	4	52.0K	38%	6.06×	91
Rope	-90.00%	11.29%	far below normal	-9	-2,250	-13%	5.89×	91
Fishing bait	25.00%	25.00%	normal	1	8,000	0%	5.52×	90
Sunfire splintersmembers	1.73%	2.04%	normal	-1	-2,890	60%	5.48×	90
Sapphire bolt tipsmembers	0.00%	11.11%	normal	0	0	88%	5.44×	91
Emerald ring	3.56%	2.85%	normal	7	15.6K	-13%	5.33×	91
Raw herring	2.54%	11.11%	below normal	2	6,348	63%	5.19×	91
Tarromin tarmembers	100.00%	0.00%	above normal	1	7,000	0%	5.06×	91
Cheese	2.50%	3.45%	normal	1	13.0K	0%	4.98×	91
Hammerstone seedmembers	50.00%	33.33%	above normal	1	2,000	0%	4.93×	91
Purple sweetsmembers	9.57%	1.69%	far above normal	250	74.0K	4%	4.93×	90
Ring of recoilmembers	1.04%	2.84%	far below normal	-11	-9,559	59%	4.90×	91
Fine fish offcutsmembers	13.33%	4.56%	far above normal	34	113K	36%	4.83×	91
Leaping troutmembers	100.00%	0.00%	above normal	2	26.0K	0%	4.81×	91
Marrentill tarmembers	100.00%	0.00%	far above normal	2	14.0K	0%	4.80×	90
Earth talisman	1.14%	2.68%	below normal	-5	-8,130	50%	4.80×	91
Raw trout	2.63%	6.06%	normal	1	15.0K	29%	4.72×	91
Yellow finmembers	13.16%	6.98%	above normal	17	112K	24%	4.72×	91
Adamant javelinmembers	6.67%	1.96%	normal	2	22.0K	7%	4.66×	91
Dodgy necklacemembers	6.96%	4.19%	far above normal	66	48.8K	44%	4.60×	91
Adamant seedsmembers	17.98%	8.57%	above normal	14	157K	38%	4.53×	91
Raw lobster	2.70%	3.70%	normal	1	9,009	41%	4.41×	91
Nail beast nailsmembers	0.41%	1.06%	normal	-15	-15.3K	101%	4.38×	90
Leaping salmonmembers	50.00%	0.00%	above normal	1	13.0K	-17%	4.25×	91
Frozen tearmembers	12.68%	7.49%	above normal	22	107K	13%	4.06×	91
Emerald bolt tipsmembers	0.00%	5.13%	normal	0	0	90%	4.05×	91
Guam tarmembers	66.67%	11.11%	above normal	6	42.0K	39%	3.98×	91
Vial of bloodmembers	0.13%	2.21%	far below normal	-148	-18.6K	28%	3.98×	91
Energy potion(4)	3.28%	4.19%	normal	2	4,000	8%	3.96×	91
Bucket of sandmembers	20.00%	5.56%	above normal	1	13.0K	0%	3.83×	90
Frost dragon bonesmembers	3.85%	1.97%	far above normal	117	17.8K	61%	3.83×	91
Uncut jademembers	110.00%	5.95%	far above normal	32	320K	-34%	3.63×	91
Diamond	3.38%	1.12%	far above normal	20	13.3K	42%	3.56×	91
Seeking dragon arrowmembers	1.77%	1.24%	above normal	-7	-2,338	91%	3.55×	90
Broad arrowheadsmembers	9.09%	5.88%	normal	4	28.0K	44%	3.46×	91
Black chinchompamembers	1.00%	2.04%	far below normal	-37	-9,990	103%	3.36×	90
Yanillian hopsmembers	13.73%	4.08%	far above normal	59	116K	1%	3.32×	91
Fish offcutsmembers	16.67%	25.00%	normal	1	8,000	-11%	3.26×	91
Kwuarmmembers	0.38%	0.56%	normal	-29	-15.8K	7%	3.24×	91
Mind rune	33.33%	33.33%	normal	1	18.0K	100%	3.20×	90
Ruby	0.84%	2.04%	far below normal	-8	-11.2K	29%	3.10×	90
Vial of water	16.67%	0.00%	normal	1	13.0K	67%	3.08×	90

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.