Stevenson and Wolfers provide a number of possible reasons why this occurred, including non-comparable data over time, and increasing income inequality in the US during this period.

史蒂文森和沃尔弗斯给出了很多可能因素，解释造成此现象发生的原因，其中包括随着时间的消逝数据的不具可比性和这段时期内美国收入增加的日渐不平等。

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Patients treated non-operatively, who survived 30 days after fracture, had a mortality rate over the following year comparable with those who had undergone surgery.

生存超过骨折后30天的非手术治疗患者，其随后一年的死亡率与手术治疗患者相当。

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The Middle East accounts for less than 1% of world non-fuel exports, compared with 4% from Latin America (a region with a comparable population).

世界非油类出口总额中，仅有不到1%来自中东地区，而人口规模类似的拉丁美洲地区占4%。

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Stifel Niclaous analyst David Grossman points out in a research note this morning that profits adjusted for the non-comparable tax rate missed the Street consensus by 27 cents a share.

FORBES: Computer Sciences Swoons As Q1 Profits Miss; New Biz Falls

The accompanying tables have more details on the GAAP financial measures that are most directly comparable to non-GAAP financial measures and the related reconciliations between these financial measures.

ENGADGET: Google's Q4 2011 results: $2.71 billion profit, $8.13 billion in revenue, Wall Street disappointed

This press release, the financial tables, as well as other supplemental information including the reconciliations of certain non-GAAP measures to their nearest comparable GAAP measures, are also available on that site.

ENGADGET: Google's Q4 2011 results: $2.71 billion profit, $8.13 billion in revenue, Wall Street disappointed