The trick is to find an “instrumental variable” which can act as a proxy for one variable in a statistical analysis, but which is clearly unrelated to the others.
诀窍在于找到一种“工具性可变因素”，它能在统计分析中代替某种可变因素，但它显然与其他可变因素无关。
In studying the dependence of one variable on one or more other variables, regression analysis often involves tedious and lengthy calculations.
研究某个变数对另一个或多个其他变数的依赖关系时，回归分析常常要进行冗长烦琐的计算。
The analysis of pointer variable and inter procedure data is one of the key problem in the whole program analysis of nested language.
对指针变量以及过程间的数据的分析是嵌套式语言全程分析的关键问题之一。
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