名词短语
中文翻译：对变异的改进估计
同义词：
['improved estimate of variance', 'improved variance estimation']
例句：
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1. The improved estimation of the population growth rate has led to more accurate predictions.
对人口增长率的改进估计导致预测更加准确。
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2. The improved variance estimation technique is crucial for understanding the distribution of data.
改进的方差估计技术对于理解数据分布至关重要。
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3. The research team used improved variance estimation methods to improve the accuracy of their forecasts.
研究团队使用改进的方差估计方法来提高他们预测的准确性。