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Invention chance math
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Never Enough
The Candle Factory
#1 - 2015-08-09 13:10:04 UTC
Help me understand the math behind invention.

My first thought was that invention follows the same rule as resists:
"+15% to invention success" really means "-15% to invention failure"

http://imgur.com/PBFVc5v

Applying this logic to image above:

Base chance to succeed = 34%
Base "chance to fail" = 66% (0.66)

By adding the decryptor we get chance to fail
0.66 * (1 - 0.5) = 0.33

Factoring in skills:
0.33 * (1 - 0.367) = 0.20889

So the final chance to fail is 20.9%
(Chance to succeed is 79.1%)

The game says this math is wrong.
Where is the mistake ?

Thanks in advance.
Elizabeth Norn
Nornir Research
Nornir Empire
#2 - 2015-08-09 15:44:34 UTC  |  Edited by: Elizabeth Norn
In invention's case they are percentage based bonuses, to work it out you just multiply everything together like this: 0.34 * 1.5 * 1.367 (base value * 1.modifierX * 1.modifierY) = 0.69717. Which way it rounds is another question altogether though Big smile.

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Tau Cabalander
Retirement Retreat
Working Stiffs
#3 - 2015-08-09 23:06:51 UTC  |  Edited by: Tau Cabalander
Dev Blog - Invention updates in Phoebe

Dev Blog - Invention updates in Phoebe wrote:
The new invention formula thus is:
http://content.eveonline.com/www/newssystem/media/66626/1/REinvformula2.png

In addition, base invention chance for all items is going to be modified to compensate for the formula tweaks above:
* All modules, rigs , ammo and all intact Ancient Relics: from 40% to 34%
* All Frigates, Destroyers and all malfunctioning Ancient Relics: from 35% to 30%
* Cruisers, Battlecruisers, Mining Barges, Industrials: from 30% to 26%
* All Battleships and all wrecked Ancient Relics: from 25% to 22%
* Freighters: from 20% to 18%
Never Enough
The Candle Factory
#4 - 2015-08-10 01:31:16 UTC
Much appreciated.
Do Little
Bluenose Trading
#5 - 2015-08-11 08:35:58 UTC
There are several calculators online. For example: http://www.eve-cost.eu/invention