Dummy Index

By Kardi Teknomo, PhD .

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Can I change the dummy index in the Sum?

Yes, you can. Here is the example formula

dummy index formula

Name of index and range is not always from 1 or from 0, it can start from any number. Index is dummy name. The name is not important; you can put any name as long as they are consistent.

Example

If we have a sequence of numbers dummy index example then we can put index on the sequence such that dummy index meaning , dummy index , dummy index , dummy index , dummy index , dummy index and

dummy index example

But you can also start the index from zero if you like such that

dummy index , dummy index , dummy index example , dummy index , dummy index , dummy index and

dummy index sum

Of course, the results are the same because actually they sum over the same sequence of numbers.

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See Also: Kardi Teknomo's Tutorial

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Preferable reference for this tutorial is

Teknomo, Kardi (2015) Summation Tutorial. http://people.revoledu.com/kardi/tutorial/BasicMath/Sum/