When the risk is regarded as an indirectly measured latent variable which can be described by some index variables.

可变的数量标志和所有的统计指标称作变量。

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Repameterizing the average tree height growth model improved the fitting results a lot by introducing site index and density index variables.

引入地位指数和密度指数可大幅提高林龄单因变量平均高生长模型的拟合度。

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Some extraordinarily clever person realized that since ESP was now an index register the EBP register no longer had to be dedicated for accessing variables on the stack. In other words, instead of

某些异常聪明的人意识到既然ESP现在成了索引寄存器，EBP寄存器不再致力于访问栈上的变量。

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None of the measured variables in the freedom index relate to health care per se.

FORBES: Study Finds US Slips in Freedom, Health

Messrs Frey and Stutzer find that a one-point increase in this democracy index, after stripping out the effects of the other variables, increases the share of people who say they are very happy by 2.7 percentage points.

ECONOMIST: Happiness is a warm vote

They use a forecasting model that relies, in particular, on the close historical relationship between company profits and two variables, total corporate investment in equipment and the commodity-price index published by The Economist.

ECONOMIST: American shares