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Just a note

In other words, instead of calculating their sum (ΣY=Y1+Y2+Y3...+Yn), you multiply your observations together (ΠY=Y1Y2Y3...Yn).

Notice that, in using their sum, you are assuming effects (and the effect of errors) are additive. In using their product, you are assuming effects are multiplicative. Which of these 'models' are reasonable depends entirely upon the situation.