restricted and unrestricted random walk

例句：

1. 1.In the study of economics, a restricted random walk model is often used to analyze fluctuations in stock prices.
   在经济学研究中，经常使用受限随机游走模型来分析股票价格的波动。
2. 2.The researcher found that the unrestricted random walk model could better explain the market behavior.
   研究者发现，无限制随机游走模型更能解释市场行为。
3. 3. The researchers conducted an experiment to test the effectiveness of both models in predicting stock prices.
   研究人员进行了实验，以测试这两种模型预测股票价格的效果。