Additive, Semi-Additive and Non-Additive Measures

Let us begin with the definition of each which will be followed by examples:

1. Additive measures: These are those specific class of fact measures which can be aggreagated across all dimension and their hieracchy

2. Semi-Additive measures: These are those specific class of fact measures which can be aggreagated across all dimension and their hieracchy except the time dimension

3. Non-additive measures: These are those specific class of fact measures which cannot be aggreagated across all/any dimension and their hieracchy

For example:

A) We have sales figures...one may tend to add sales across all quareters to avail the yearly sales..hence this is an example of Additive measure

B) We have stock levels say 1000(qty of Item A) on Monday...I sell 200(qty of Item A) on Tuesday I further sell 300(qty of Item A) on Wednesday...going by basic math On Thursday I should be left with 500(qty of Item A, assuming no inventory has flown in) to obtain current stock level I cannot aggregate the Stock sales across time dimension hierarchy...If done I will have inappropriate outcomes

C) Aggregation of percentage or dates is an Ideal example of non-additive measures.

 Happy Learning !!

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