What is the rate of change?
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The average rate of change between two input values is the total change of the function values (output values) divided by the change in the input values  

The calculation for ROC is simple in that it takes the current value of a stock or index and divides it by the value from an earlier period. Subtract one and multiply the resulting number by 100 to give it a percentage representation.

I know it`s not the answer but I hope it helps a little Δ    Δ

                                                                                   ⊂∵°ω°⊃

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