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
Anglerfishmembers	6.48%	1.79%	far above normal	62	44.1K	9%	1.61×	91
Bronze nailsmembers	375.00%	50.00%	far above normal	15	195K	100%	1.47×	91
Papaya fruitmembers	10.22%	2.52%	far above normal	107	80.4K	4%	1.52×	91
Manta raymembers	6.34%	2.29%	far above normal	40	43.0K	-32%	1.43×	91
Sapphire dragon bolts (e)members	9.32%	3.13%	far above normal	168	71.4K	37%	2.02×	90
Smoke runemembers	16.36%	4.08%	far above normal	8	144K	23%	1.51×	90
Marlinmembers	6.05%	2.18%	far above normal	126	39.2K	12%	1.57×	91
Mahogany logsmembers	12.90%	3.23%	far above normal	7	77.0K	7%	1.74×	90
Amethyst arrowmembers	10.00%	2.87%	far above normal	8	80.0K	8%	1.35×	90
Steel dart tipmembers	16.00%	2.38%	far above normal	11	143K	-8%	2.46×	90
Green dragonhidemembers	3.79%	0.93%	far above normal	23	17.8K	6%	1.58×	91
Amethystmembers	4.77%	1.10%	far above normal	60	26.7K	-9%	1.96×	91
Grimy ranarr weedmembers	2.18%	0.46%	far above normal	7	1,463	-17%	1.52×	91
Torstolmembers	3.21%	0.81%	far above normal	38	11.5K	29%	2.60×	91
Silver ore	13.21%	1.55%	far above normal	6	78.0K	36%	3.19×	90
Harralander potion (unf)members	10.67%	4.27%	far above normal	37	85.8K	9%	2.62×	90
Prayer potion(4)members	2.52%	1.00%	far above normal	38	4,712	-11%	1.61×	90
Onyx boltsmembers	2.32%	0.63%	far above normal	22	2,706	-3%	1.51×	91
Dragonstone bolt tipsmembers	5.67%	1.75%	far above normal	11	39.0K	-11%	1.73×	91
Dynamitemembers	9.88%	2.25%	far above normal	7	86.4K	-6%	3.29×	91
Blighted super restore(4)members	5.15%	2.51%	far above normal	87	30.4K	53%	0.96×	90
Dragon javelin tipsmembers	4.79%	2.17%	far above normal	16	27.3K	-24%	1.15×	91
Raw sharkmembers	3.46%	1.59%	far above normal	7	14.2K	-4%	1.83×	90
Dragon javelinmembers	6.82%	3.55%	far above normal	21	47.7K	6%	1.04×	91
Diamond bolts (e)members	10.10%	4.03%	far above normal	8	80.8K	4%	1.05×	91
Saradomin brew(4)members	3.09%	1.50%	far above normal	60	10.3K	2%	2.18×	90
Seeking amethyst arrowmembers	7.96%	3.70%	far above normal	30	58.2K	34%	1.61×	91
Steel bar	3.16%	1.24%	far above normal	6	11.9K	-1%	1.58×	90
Gold necklace	7.92%	4.14%	far above normal	6	59.4K	-33%	4.91×	91
Mithril bar	2.84%	1.47%	far above normal	7	8,288	20%	1.69×	91
Dragon bonesmembers	2.54%	1.45%	far above normal	17	4,896	47%	1.21×	90
Magic longbowmembers	2.70%	1.34%	far above normal	7	6,741	-23%	1.82×	90
Molten glassmembers	8.11%	3.53%	far above normal	5	65.0K	32%	1.15×	90
Uncut emerald	4.41%	1.97%	far above normal	8	23.5K	1%	2.06×	91
Steel arrow	28.57%	11.11%	far above normal	2	14.0K	25%	1.95×	91
Adamant arrow	10.00%	3.85%	far above normal	2	22.0K	0%	1.92×	90
Revenant ethermembers	3.59%	2.34%	far above normal	3	18.0K	50%	1.07×	91
Moonlight antler boltsmembers	10.14%	3.49%	far above normal	12	81.1K	2%	1.86×	91
Lemonmembers	92.31%	18.45%	far above normal	23	299K	-22%	468.51×	91
Sunlight antler boltsmembers	10.98%	4.98%	far above normal	15	91.5K	42%	0.99×	91
Teak logsmembers	10.53%	5.13%	far above normal	7	91.0K	3%	1.07×	91
Raw swordfish	5.00%	2.13%	far above normal	6	33.3K	-26%	1.77×	91
Red dragonhidemembers	2.93%	1.03%	far above normal	17	8,738	21%	1.54×	91
Divine ranging potion(4)members	3.44%	2.44%	far above normal	79	13.7K	45%	2.14×	91
Lava scale shardmembers	27.42%	8.22%	far above normal	16	176K	35%	4.08×	91
Gold amulet (u)	15.08%	5.23%	far above normal	17	135K	11%	2.39×	91
Uncut ruby	3.04%	1.56%	far above normal	8	10.1K	-12%	2.43×	91
Dwarf weedmembers	2.64%	0.88%	far above normal	7	6,608	15%	1.13×	91
Iron knifemembers	16.67%	7.69%	far above normal	6	42.0K	0%	2.09×	91
Ancient essencemembers	7.14%	0.00%	far above normal	1	71.4K	0%	2.04×	91
Sharkmembers	3.42%	1.61%	far above normal	10	13.7K	-4%	1.64×	90
Mithril dart tipmembers	7.61%	2.79%	far above normal	6	65.2K	4%	1.75×	90
Wrath runemembers	3.39%	1.74%	far above normal	4	13.6K	10%	1.37×	90
Dragon dartmembers	3.20%	2.01%	far above normal	13	11.6K	90%	3.78×	90
Adamant boltsmembers	7.33%	3.25%	far above normal	8	53.3K	28%	1.93×	90
Adamantite ore	2.91%	1.46%	far above normal	4	9,708	3%	2.40×	90
Blood runemembers	2.70%	1.76%	far above normal	3	9,009	46%	1.90×	90
Pearl bolt tipsmembers	66.67%	0.00%	far above normal	4	44.0K	38%	2.24×	91
Burnt pagemembers	4.53%	2.12%	far above normal	121	24.4K	17%	1.45×	91
Tuna	14.81%	2.44%	far above normal	4	24.0K	0%	1.00×	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.