外部变量：在研究中不是独立变量的随机变量，可能对被研究主体的行为产生任何影响。
外部变量
外扰变量
额外变量
客变量
... 随机变换 stochastic transformation 随机变量 chance variable; extraneous variable; facultative variant; ramdom variable; random variables; randomvariable; stochastic variables; variate 随机变时 random variable ...
[计]额外变量；外扰变量；客变量；随机变量
The price of Wheaties is not enough of a shared experience, and too variable due to all sorts of extraneous factors, to be used as a benchmark for anything.
FORBES: Oil Continues to Rise Because the Dollar Continues to Fall