confounding variables

基本解释

This is a problem in nearly every study, and even in studies controlling for known confounding variables, residual confounding remains a concern.
這幾乎每個研究都存在的問題，甚至在控制已知混襍因素的研究中，其他的混襍因素依然受到人們的關注。
The study sounds simple, but the design of the experiments was actually somewhat complex, because the researchers had to overcome a number of confounding variables.
這個實騐聽起來很簡單，但是實騐的設計確實有一定程度的複襍性，因爲研究人員不得不尅服一些混淆變量。
They also knew that, by working with surveys from three countries, and with such a wide range of ages, they would diversify the data and iron out confounding variables.
他們也明白研究三個國家的調查結果，而且是這麽廣的年齡跨度，他們能使數據多樣化且消除混襍變量。

Dr Wilson and Dr Storm restricted their study to white, Protestant teenagers, in order to eliminate confounding variables.
ECONOMIST: Human evolution
This was despite nearly identical power outputs in all four tests and efforts to control for possible confounding variables, such as the time of day.
ECONOMIST: Exercise and company
By a useful (though hardly unexpected) coincidence, all the businessmen were male and all were white, so there were no confounding variables of race or sex.
ECONOMIST: Physiognomy and success: Face value