The index works by taking a weighted average of the price of imported iron and domestically produced iron ore to produce a composite number.

这种指数通过对进口铁和国产铁矿石取以加权平均价格以此产生一个合成数。

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The Dow is a relic of a market indicator; an average, not an index, weighted by price, not by market value.

道指是业已过时的市场指标；它是平均数，而非指数；以市价而非市值为权重。

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And Australia's official index, a weighted average of prices in eight capital cities, was boosted by booms in Perth (up by 36.9% in the year to the fourth quarter) and Darwin (17.6%).

在澳大利亚，由于珀斯和达尔文房价上涨，其中，珀斯去年包括第四季度房价上涨36.9%，达尔文则上涨17.6%，所以澳大利亚的官方指数高于八个中心城市的平均价。

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This technique reduced the average market cap relative to the cap weighted index and helped boost the return.

FORBES: Any Monkey Can Beat the Market

For example, the Goldman Sachs monetary-conditions index (based on a weighted average of short-and long-term interest rates and the trade-weighted exchange rate) suggests that America's monetary policy is currently at its tightest since 1989, largely reflecting the strong dollar.

ECONOMIST: The stockmarket economy