RE: First observations of my RAC prediction experiment by ropaga

Viewing a response to: @jefpatat/first-observations-of-my-rac-prediction-experiment

gridcoin · @ropaga · Sep 7 '17

RAC is based on two factors:

-Credits: Every project decides the amount of credits that provides for completing every task. Most projects just give a credit reward proportional to FLOPS required estimation. Projects that has more than one app can give additional credits to one or more apps.

-Time: The average number of Credits per day granted recently. This average decreases by a factor of two every week.

https://boinc.berkeley.edu/wiki/Computation_credit

👍 m3rcos1ty

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@jefpatat · Sep 7 '17

That is what the explanation states. And I believe it was correct for a previous version. The math in the code is different.
https://web.archive.org/web/20080311233928/http://www.boinc-wiki.info:80/Recent_Average_Credit#Updating_the_RAC is the best source I know of. Still... Code is the best source.

👍 ropaga, jefpatat, m3rcos1ty

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@ropaga · Sep 7 '17 (edited)

Actually doing the math the formula does the same I said, probably I have not explained myself properly. RAC value is a weighted mean, today credits has the maximum weight, credits obtained  31 August has 1/2 weight than today, credits obtained 24 August has 1/4 weight than today and so on.

👍 m3rcos1ty

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@jefpatat · Sep 7 '17

No, that is not completely correct. The decay works as you explain it (I think, I have not yet looked at it in detail) But the build up is explained like that but doesn't function like that. It is explained as a low pass filter. Older values have less weight. The important difference is the point of calculation. It is like a low pass filter with 'random' sampling points. The calculation happens every time when a new result is available. There is nothing that calculates the RAC every day so there is no way to calculate it as you explain it. Reread the article observation 2 and 3. 

To clarify. Suppose you have one task that takes 13 hours. Today you will have one result, tomorrow you will have two, the next day one, ... The way you explain it will yield a different result than the way I explain it because you will have a different amount of calculation points.

👍 ropaga, jefpatat, m3rcos1ty

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