RuneScape:Grand Exchange Market Watch/Herb Index

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The Herb Index is made up of a weighted average of all of the grimy and clean herbs listed in the Market Watch, with the starting date of this average on 10 June 2009, at an index of 100. The overall rising and falling of herb prices is reflected in this index.

While specialised for just watching herb prices, it is set up and adjusted in a manner similar to the Common Trade Index, and the divisor may be adjusted to include new herbs added by Jagex (see the FAQ for more information).

As of today, this index is 525.12  -4.47

Historical chart

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Summary

Any suggested changes to this index should be added to the talk page.

• Start date: 10 June 2009 (at index of 100)
• Index today: 525.12
• Change today:  -4.47
• Number of items: 34 (last adjusted on 6 November 2011)
• Index divisor: 33.2409 (last adjusted on 6 November 2011)

List of items

This is the current list of items included in this index:

Icon	Item	Price	Direction	Low Alch	High Alch	Limit	Members	Details	Last updated
	Grimy guam	437		12	18	10,000		view	6 hours ago
	Grimy marrentill	4,713		1	1	10,000		view	6 hours ago
	Grimy tarromin	190		1	1	10,000		view	6 hours ago
	Grimy harralander	1,065		1	1	10,000		view	6 hours ago
	Grimy ranarr	4,896		1	1	10,000		view	6 hours ago
	Grimy toadflax	4,386		1	1	10,000		view	6 hours ago
	Grimy irit	530		1	1	10,000		view	6 hours ago
	Grimy wergali	10,936		1	1	10,000		view	6 hours ago
	Grimy spirit weed	9,859		1	1	10,000		view	6 hours ago
	Grimy avantoe	1,286		1	1	10,000		view	6 hours ago
	Grimy kwuarm	1,086		1	1	10,000		view	6 hours ago
	Grimy snapdragon	1,456		1	1	10,000		view	6 hours ago
	Grimy cadantine	2,175		1	1	10,000		view	6 hours ago
	Grimy lantadyme	11,007		1	1	10,000		view	6 hours ago
	Grimy dwarf weed	13,308		1	1	10,000		view	6 hours ago
	Grimy torstol	16,047		1	1	10,000		view	6 hours ago
	Grimy fellstalk	12,001		40	60	10,000		view	6 hours ago
	Clean guam	502		12	18	10,000		view	6 hours ago
	Clean marrentill	5,022		2	3	10,000		view	6 hours ago
	Clean tarromin	194		4	6	10,000		view	6 hours ago
	Clean harralander	1,561		8	12	10,000		view	6 hours ago
	Clean ranarr	5,409		10	15	10,000		view	6 hours ago
	Clean toadflax	5,093		19	28	10,000		view	6 hours ago
	Clean irit	831		16	24	10,000		view	6 hours ago
	Clean wergali	11,530		17	26	10,000		view	6 hours ago
	Clean spirit weed	9,721		9	14	10,000		view	6 hours ago
	Clean avantoe	1,648		19	28	10,000		view	6 hours ago
	Clean kwuarm	1,513		21	32	10,000		view	6 hours ago
	Clean snapdragon	1,855		23	35	10,000		view	6 hours ago
	Clean cadantine	2,609		26	39	10,000		view	6 hours ago
	Clean lantadyme	11,870		27	40	10,000		view	6 hours ago
	Clean dwarf weed	14,089		28	42	10,000		view	6 hours ago
	Clean torstol	16,868		30	45	10,000		view	6 hours ago
	Clean fellstalk	12,534		60	90	10,000		view	6 hours ago

Adjustments

6 November 2011

Adjusted index: Herb Index Adjustment date: 6 November 2011 Affected templates: Template:GE Herb Index and Template:GE Herb Index/Diff Added item(s): Grimy fellstalk, Clean fellstalk Removed item(s): None Items before adjustment: 32 Items after adjustment: 34 Divisor before adjustment: 32.0000 Divisor after adjustment: 33.2409 Item Base date Base price Price on adjustment date Comments Grimy guam 9 June 2009 490 121 Unchanged Grimy marrentill 192 25 Grimy tarromin 216 121 Grimy harralander 787 100 Grimy ranarr 7,654 4,032 Grimy toadflax 2,315 3,637 Grimy irit 1,552 1,172 Grimy wergali 1,800 2,450 Grimy spirit weed 1,917 2,658 Grimy avantoe 1,591 3,293 Grimy kwuarm 2,850 1,356 Grimy snapdragon 9,720 5,224 Grimy cadantine 1,234 1,186 Grimy lantadyme 1,272 5,006 Grimy dwarf weed 2,042 4,744 Grimy torstol 2,980 25,300 Clean guam 481 126 Clean marrentill 101 16 Clean tarromin 193 143 Clean harralander 791 100 Clean ranarr 7,719 3,867 Clean toadflax 2,362 3,644 Clean irit 1,795 1,232 Clean wergali 2,000 2,331 Clean spirit weed 1,888 2,725 Clean avantoe 1,593 3,253 Clean kwuarm 2,881 1,389 Clean snapdragon 9,726 5,402 Clean cadantine 1,245 1,206 Clean lantadyme 1,319 5,267 Clean dwarf weed 2,070 4,668 Clean torstol 2,762 25,400 Grimy fellstalk – – 1,799 Added item Clean fellstalk 1,437 Calculations From the old divisor obtained from the templates: ${div}_{\text{old}}=32.0000$ We need to calculate a new divisor: ${div}_{\text{new}}={div}_{\text{old}}\times {\frac {\sum \left({\frac {p}{q}}\right)_{\text{new}}}{\sum \left({\frac {p}{q}}\right)_{\text{old}}}}$ To calculate the new divisor, we need to find: ${\begin{aligned}\sum \left({\frac {p}{q}}\right)_{\text{old}}&={\text{sum of ratios prior to change}}\\&={\frac {121}{490}}+{\frac {25}{192}}+{\frac {121}{216}}+\dots +{\frac {25,400}{2,762}}\\&=51.57722802{\text{ (up to 8 d.p.)}}\end{aligned}}$ And also: ${\begin{aligned}\sum \left({\frac {p}{q}}\right)_{\text{new}}&={\text{sum of ratios prior to change}}-{\text{sum of removed ratios}}+{\text{sum of added ratios}}\\&=\sum \left({\frac {p}{q}}\right)_{\text{old}}-{\text{sum of removed ratios}}+{\text{number of added items}}\\&=51.57722802-0+2\\&=53.57722802{\text{ (up to 8 d.p.)}}\end{aligned}}$ Thus, the new divisor is: ${\begin{aligned}{div}_{\text{new}}&={div}_{\text{old}}\times {\frac {\sum \left({\frac {p}{q}}\right)_{\text{new}}}{\sum \left({\frac {p}{q}}\right)_{\text{old}}}}\\&=32.0000\times {\frac {53.57722802}{51.57722802}}\\&=33.2409{\text{ (4 d.p.)}}\end{aligned}}$