RuneScape:Grand Exchange Market Watch/Herb Index

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 393.10  -1.81

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: 393.10
• Change today:  -1.81
• 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:

Adjustments

Icon	Item	Price	Direction	Low Alch	High Alch	Limit	Members	Details	Last updated
	Grimy avantoe	1,043		0	0	10,000		view	4 years ago
	Grimy cadantine	4,322		0	0	10,000		view	4 years ago
	Grimy dwarf weed	8,476		0	0	10,000		view	4 years ago
	Grimy guam	709		12	18	10,000		view	4 years ago
	Grimy harralander	741		0	0	10,000		view	4 years ago
	Grimy irit	5,008		0	0	10,000		view	4 years ago
	Grimy kwuarm	11,782		0	0	10,000		view	4 years ago
	Grimy lantadyme	7,551		Cannot be alchemised		10,000		view	4 years ago
	Grimy marrentill	2,307		0	0	10,000		view	4 years ago
	Grimy ranarr	1,860		0	0	10,000		view	4 years ago
	Grimy snapdragon	1,789		0	0	10,000		view	4 years ago
	Grimy tarromin	105		0	0	10,000		view	4 years ago
	Grimy torstol	5,389		0	0	10,000		view	4 years ago
	Clean lantadyme	8,002		27	40	10,000		view	4 years ago
	Clean ranarr	2,108		10	15	10,000		view	4 years ago
	Clean avantoe	1,151		19	28	10,000		view	4 years ago
	Clean cadantine	4,724		26	39	10,000		view	4 years ago
	Clean dwarf weed	8,810		28	42	10,000		view	4 years ago
	Clean fellstalk	7,166		60	90	10,000		view	4 years ago
	Clean guam	738		12	18	10,000		view	4 years ago
	Clean harralander	938		8	12	10,000		view	4 years ago
	Clean irit	5,305		16	24	10,000		view	4 years ago
	Clean kwuarm	11,981		21	32	10,000		view	4 years ago
	Clean marrentill	2,516		2	3	10,000		view	4 years ago
	Clean snapdragon	1,979		23	35	10,000		view	4 years ago
	Clean spirit weed	17,285		9	14	10,000		view	4 years ago
	Clean tarromin	127		4	6	10,000		view	4 years ago
	Clean toadflax	11,699		19	28	10,000		view	4 years ago
	Clean torstol	5,548		30	45	10,000		view	4 years ago
	Clean wergali	2,593		17	26	10,000		view	4 years ago
	Grimy fellstalk	6,860		40	60	10,000		view	4 years ago
	Grimy spirit weed	16,575		0	0	10,000		view	4 years ago
	Grimy toadflax	11,250		0	0	10,000		view	4 years ago
	Grimy wergali	2,701		0	0	10,000		view	4 years ago

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: $\begin{align} \sum \left ( \frac{p}{q} \right )_{\text{old}} & = \text{sum of ratios prior to change} \\ & = \frac{121}{490} + \frac{25}{192} + \frac{121}{216} + \dots + \frac{25,400}{2,762} \\ & = 51.57722802 \text{ (up to 8 d.p.)} \end{align}$ And also: $\begin{align} \sum \left ( \frac{p}{q} \right )_{\text{new}} & = \text{sum of ratios prior to change} - \text{sum of removed ratios} + \text{sum of added ratios} \\ & = \sum \left ( \frac{p}{q} \right )_{\text{old}} - \text{sum of removed ratios} + \text{number of added items} \\ & = 51.57722802 - 0 + 2 \\ & = 53.57722802 \text{ (up to 8 d.p.)} \end{align}$ Thus, the new divisor is: $\begin{align} {div}_{\text{new}} & = {div}_{\text{old}} \times \frac{\sum \left ( \frac{p}{q} \right )_{\text{new}}}{\sum \left ( \frac{p}{q} \right )_{\text{old}}} \\ & = 32.0000 \times \frac{53.57722802}{51.57722802} \\ & = 33.2409 \text{ (4 d.p.)} \end{align}$