The "what-if analysis" USES a virtual index under the covers to assess the effective of the indexes.

“如果这样会怎样的分析”使用了虚拟索引来评估索引的效果。

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Any Changes in this section are temporary, for what-if analysis purposes, and discarded after logout.

此部分任何的改变是暂时的，因为是假定分析的目的，注销后数据就会丢失。

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Because it is so easy to experiment with different Numbers, spreadsheet software is particularly useful for what-if analysis.

因为它很容易与不同的数字实验，电子表格软件是特别有用的假设分析。

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With the software, companies can do things like track website conversions and ticket backlogs, as well as engage in what-if analysis.

FORBES: GoodData Hits a Gusher with Big Data

As a result, they can do what-if analysis, model data, and run sophisticated data mining and forecasting algorithms that return answers within minutes, enabling them to fine-tune and refine their offers and service bundles to accurately reflect the needs of their subscribers.

FORBES: Big Data: A Picture Is Worth A Thousand Words

What happens to this analysis if we start talking about Apple moving 40-50M TVs per year?

FORBES: Another Key Reason for Apple to Get Into the TV Business