在我的数据透视表中出现的这些迹象是什么？

Question

我正在使用PowerPivot构建很多数据透视表，我看到有一些数据透视表在数据透视字段中有Sigma符号，如image：

这些迹象似乎只出现在一些数据透视表上，所以任何人都可以告诉我这些迹象是什么？

谢谢！

Answer 1

 ∑

  ...is the summation symbol.

In mathematics, summation (capital Greek sigma symbol: ∑; _Unicode: U+2211_{; HTML:} ∑) is the addition of a sequence of numbers; the result is their sum or total. If numbers are added sequentially from left to right, any intermediate result is a partial sum, prefix sum, or running total of the summation. _(Source)

For the summation of the sequence of consecutive integers from 1 to 100, one could use an addition expression involving an ellipsis (…) to indicate the missing terms: 1 + 2 + 3 + 4 + … + 99 + 100. In this case, the reader can easily guess the pattern. However, for more complicated patterns, one needs to be precise about the rule used to find successive terms, which can be achieved by using the summation operator "Σ". Using this sigma notation the above summation is written as:

    

The value of this summation is 5050. It can be found without performing 99 additions, since it can be shown (for instance by mathematical induction) that:

    

...for all natural numbers n.5 More generally, formulae exist for many summations of terms following a regular pattern.

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Or, to summarize the definition:

sum·ma·tion    səˈmāSH(ə)n/    Noun

1. The process of adding things together.

   • _{‘the summation of numbers of small pieces of evidence’}

2. A summary.

   • _{‘two summations of his work were published’}

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Short Answer:

  Replace the ∑ symbol with Sum: where it appears in Pivot Tables.

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More information:

• Stack Overflow: Split items in '∑ Values' value label of Pivot Table

• Book Preview: Power Excel 2016 with Mr. Excel: Master Pivot Tables, Subtotals, Charts

• More about the symbol

• Wikipedia: Summation

• Use a Pivot Table to Summarize Detailed Data

• ubc.ca .pdf: The Summation Operator