Based on the significance test method, there will be some influence if I 2 is less than 0.05, whereas the influence is significant when I 2 is less than 0.01, and the influence is extremely significant when I 2 is less than 0.001.
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A Driver's Physiology Sensor-Based Driving Risk Prediction Method for Lane-Changing Process Using Hidden Markov Model.
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The sentences
With the increase of driving duration, both indicators and their variances showed a trend of increasing continuously.