In this paper, the sample database for data mining is designed by analyzing historical data of raw cotton property and spinning yarn quality.
通过对原棉性能及成纱质量历史数据的分析，建立了用于数据挖掘的样本库。
Based on the historical and present monitoring data, the underwater topography, deposits, pollution sources and water environment quality of Kuncheng Lake of Changshu City were studied.
结合历史数据和现状调查，对常熟市昆承湖水下地形、沉积物、污染源和湖泊水环境质量现状进行了研究。
Based on a great amount of historical data to analyze the evolution of Guangzhou reach of Pearl River and the changes of water environmental quality qualitatively and quantitatively.
通过大量的历史数据，对珠江广州河段的演变和水环境质量的变化作了定性、定量分析。
Through discussing the quality status, the error categories of Guangxi historical surface meteorological data and its cause, it is advantageous to users in processing data objectively.
通过对广西历史地面气象资料的质量评估，分析地面历史资料整体质量状况、疑误数据类别和原因，让用户在使用数据时有一个全局和客观定量的把握。
Intelligent evaluation model for air quality based on C4.5 decision tree algorithm is established through the historical data of air pollutants and air quality classes in this article.
本文采用C4.5决策树算法构建空气质量评价系统，挖掘空气污染物和空气等级关系的历史数据，建立空气污染物-空气等级智能评价模型。
Intelligent evaluation model for air quality based on C4.5 decision tree algorithm is established through the historical data of air pollutants and air quality classes in this article.
本文采用C4.5决策树算法构建空气质量评价系统，挖掘空气污染物和空气等级关系的历史数据，建立空气污染物-空气等级智能评价模型。
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