I am part of an association in which voters have votes with different weights. Example:

Question: Which color do you like?
Voters: John (vote weight = 0.522), Maria (vote weight = 0.600), Heitor (vote weight = 0.700)
Response options: blue and red

John and Mary voted in blue. Heitor voted for red

Expected end result:
Blue: 1.122
Red: 0.700

It is possible?

I think these kind of calculations should be made in the analysis software (Excel, SPSS, etc) and not in the data collection software (e.g. Limesurvey).

That said, it might be possible to find a way to get this. Not 100% sure at the moment though.
Frist step: you can pass on the weight via a custom attribute in the token table.
Then you could calculate at least the value of each vote. The problem that I see is to get the aggregated value of all voters. There is probably a way, but it is too late. I can't think of how to do this. Maybe someone can pick this up tomorrow morning...

First step: you can pass on the weight via a custom attribute in the token table.

Is a good idea... I created a "vote weight" attribute in the list of participants. I would like to calculate there. Do you know which part of the code makes the sum?

Use the Expression Manager assignment operator to set the value of a hidden (by CSS) numeric question.

manual.limesurvey.org/Expression_Manager..._Assignment_Operator

And after : you can try framagit.org/SondagePro-LimeSurvey-plugin/getStatInSurvey

I need set the value for voter and not for question

Yes i understand
1. WIth Tony Partner you have "vote weight"
2. With the plugin : you have global result in survey for "vote weight" (but looking at question : unsure you need it).