Is it possible for an estimator to be biased in finite sample but consistent in large sample 一个估计量是否有可能在有限样本中是有偏的但又具有一致性？
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5 ) this dissertation presents new predictive models for the transient stability and small signal stability based on support vector machine theory that can solve the problems such as finite samples . a new method of feature selection and sample condensation is proposed to build predictive model which improves the practicability of the model greatly 5 )论文首次利用基于小样本技术的支持向量机理论，设计了新的暂态稳定、小扰动稳定特征值预测模型，提出了新的适合预测模型构建的特征选择、数据采样策略，提高了模型的实用性。
