nonrandomized estimators

例句：

1. 1. The study used a nonrandomized sample of participants.
   该研究使用了一组非随机的参与者样本。
2. 2. Nonrandomized sampling is often used in experiments to control for confounding variables.
   非随机抽样常用于实验中以控制混杂变量。
3. 3.The researchers found that the results were not as expected due to the use of nonrandomized data.
   研究人员发现，由于使用了非随机数据，结果并不如预期。