基于时间的模糊关联规则挖掘

关联规则是数据挖掘研究中的一个重要的主题。一些算法都是假设数据中根本的关联基于时间是稳定的。然而，在现实世界领域，数据具有自己的特征，因此关联随着时间发生巨大的改变。现有的数据挖掘算法没有考虑关联的改变，这导致了严重的性能下降，特别是挖掘出的关联规则被用来分类和预测。尽管关联改变的挖掘是一个重要的问题，因为需要基于过去的历史数据来预测未来，现有的数据挖掘算法不符合这样的工作。文中引入模糊数据挖掘算法来发现基于时间的关联规则的改变。基于挖掘出的模糊规则，能预测关联规则在未来如何改变。实验表明了算法的有效性。     

关联规则挖掘Apriori算法研究综述

关联规则挖掘是数据挖掘中的一项重要技术,Apriori算法是关联规则挖掘中的一种经典算法。在信息技术的发展过程中,随着海量数据的收集和存储,从数据库中挖掘出相关联规则的数据集变得极为重要。为此,对国内外有关Apriori算法的研究现状、算法的原理、优化算法的思想进行了探讨,同时分析了几种经典的优化算法,最后对Apriori算法未来的发展趋势进行了预测和展望。     

基于改进多层次模糊关联规则的定量数据挖掘算法

针对单一层次结构实现规则提取具有规则提取准确性不高、算法运行时间长、难以满足用户使用需求的问题,提出一种基于改进多层次模糊关联规则的定量数据挖掘算法。采用高频项目集合,通过不断深化迭代的方法形成自顶向下的挖掘过程,整合模糊集合理论、数据挖掘算法以及多层次分类技术,从事务数据集中寻找模糊关联规则,挖掘出储存在多层次结构事务数据库中定量值信息的隐含知识,实现用户的定制化信息挖掘需求。实验结果表明,提出的数据挖掘算法在挖掘精度和运算时间方面相较于其他算法具有突出优势,可为多层次关联规则提取方法的实际应用带来新的发展空间。     

原关联规则及其应用

在大型数据库项目之间发现关联规则是一个重要的数据挖掘问题,而挖掘出的关联规则数目常常是巨大的。文中介绍了简单关联规则和原关联规则的概念,而传统算法挖掘出的关联规则集中的任何规则,均可以由原关联规则导出,并且原关联规则的数目远远小于传统算法挖掘出的关联规则数目。对简单关联规则和原关联规则进行了分析比较,给出了挖掘原关联规则算法,并举例说明算法的执行过程。     

关联规则在课程相关性中研究与应用

关联规则挖掘是数据挖掘领域的一个重要课题，本文介绍了在数据挖掘中关联规则的基本概念和与理论，进一步讨论了关联规则在课程相关性挖掘中的应用。学生成绩库在经过一定的预处理后，用Apriori算法挖掘出隐藏在数据背后的有用规则，以指导学生的选课。     

原关联规则及其应用

在大型数据库项目之间发现关联规则是一个重要的数据挖掘问题,而挖掘出的关联规则数目常常是巨大的.文中介绍了简单关联规则和原关联规则的概念,而传统算法挖掘出的关联规则集中的任何规则,均可以由原关联规则导出,并且原关联规则的数目远远小于传统算法挖掘出的关联规则数目.对简单关联规则和原关联规则进行了分析比较,给出了挖掘原关联规则算法,并举例说明算法的执行过程.     

基于模糊理论的量化关联规则挖掘算法

提出一种基于模糊理论的关联规则挖掘方法来处理数量属性,模糊理论能够实现数据的平滑过渡,使得挖掘出的关联规则具有高度的可理解性,给出了模糊关联规则的形式定义和挖掘算法.     

基于模糊聚类的模糊关联规则在流程企业中的应用

采用数据挖掘中的模糊聚类分析了流程企业中历史数据的区间值,然后用模糊关联规则挖掘出有用的规则。首先阐述了模糊聚类的RFCM算法和关联规则的Apriori算法的内容,分析了实现模糊关联规则的Fuzzy_ClustApriori算法流程,并用RFCM算法对实际数据进行分析,得到不同类别的模糊数。根据Fuzzy_ClustApriori算法的步骤对模糊化的参数点进行处理,得到了有价值的模糊规则,为流程企业的生产优化提供了理论依据。     

模糊关联规则挖掘在电力负荷预测中的应用

提出了一种基于模糊关联规则挖掘的电力负荷预测新方法，采用模糊C-均值算法对连续型属性域上的历史数据进行分类并模糊化，应用文中提出的模糊关联规则挖掘算法挖掘出电力负荷量与其相关环境变量间潜在的有效模糊关联规则。利用这些规则进行匹配预测，得到电力负荷量模糊化的预测结果；最后将其反模糊化，得出预测值。给出了实验仿真结果，表明了该方法的有效性。     

兴趣度在增量的关联规则挖掘中的研究

一般的关联规则发现算法使用的都是支持度、置信度框架.但是在增量的数据挖掘过程中,该类算法却需要不断改变支持度、置信度,使得算法本身效率下降,并缺乏可说服性,比如Apriori算法.为了解决该类问题,使用兴趣度框架对增量的数据进行了关联规则挖掘,比较了基于支持度、置信度框架的算法(如Apriori,FUP算法)和基于兴趣度的算法之间的优缺点.试验结果表明:兴趣度能够有效地筛选关联规则,在进行增量的数据挖掘的情况下得到的关联规则总是小于等于支持度、置信度(Aprori)算法挖掘出的规则.     

An efficient approach to mining indirect associations

Discovering association rules is one of the important tasks in data mining. While most of the existing algorithms are developed for efficient mining of frequent patterns, it has been noted recently that some of the infrequent patterns, such as indirect associations, provide useful insight into the data. In this paper, we propose an efficient algorithm, called HI-mine, based on a new data structure, called HI-struct, for mining the complete set of indirect associations between items. Our experimental results show that HI-mine's performance is significantly better than that of the previously developed algorithm for mining indirect associations on both synthetic and real world data sets over practical ranges of support specifications.     

基于项目集知识库的关联规则挖掘与更新的高效算法

通过对已有的诸关联规则挖掘与更新算法进行深入的分析和研究，指出了其共同存在的问题与不足，提出了一种基于项目集知识库的关联规则挖掘与更新方法。该方法既适应当数据库D中数据不变而用户指定的最小支持度和最小置信度这两个阈值变化的情况，也适合事务数据库D中数据发生变化的情况。当事务数据库D中数据不变时，仅需扫描数据库一次，便可建立项目集知识库KBD，然后可反复调整最小支持度和最小置信度进行关联规则挖掘与更新。而当事务数据库D中数据发生变化时，仅需扫描数据集d 和d-各一次；通过对项目集知识库KBD的更新来达到对频繁项目集和关联规则的更新。     

典型关联规则挖掘算法的分析与比较

关联规则的发现是数据挖掘的一个重要方面,目前许多研究人员正致力于关联规则的快速开采算法的研究。文中介绍了几种典型的开采大型事务数据库中所有关联规则的算法,特别针对算法过程中产生候选频繁项集的大小和所需扫描事务数据库的次数这两个影响关联规则挖掘效率的关键问题,分析各个算法采用的解决策略及相应的局限性,并比较它们的时间效率和空间效率。最后展望了关联规则挖掘算法的研究方向。     

CMRules: Mining sequential rules common to several sequences

Sequential rule mining is an important data mining task used in a wide range of applications. However, current algorithms for discovering sequential rules common to several sequences use very restrictive definitions of sequential rules, which make them unable to recognize that similar rules can describe a same phenomenon. This can have many undesirable effects such as (1) similar rules that are rated differently, (2) rules that are not found because they are considered uninteresting when taken individually, (3) and rules that are too specific, which makes them less likely to be used for making predictions. In this paper, we address these problems by proposing a more general form of sequential rules such that items in the antecedent and in the consequent of each rule are unordered. We propose an algorithm named CMRules for mining this form of rules. The algorithm proceeds by first finding association rules to prune the search space for items that occur jointly in many sequences. Then it eliminates association rules that do not meet the minimum confidence and support thresholds according to the sequential ordering. We evaluate the performance of CMRules in three different ways. First, we provide an analysis of its time complexity. Second, we compare its performance (in terms of execution time, memory usage and scalability) with an adaptation of an algorithm from the literature that we name CMDeo. For this comparison, we use three real-life public datasets, which have different characteristics and represent three kinds of data. In many cases, results show that CMRules is faster and has a better scalability for low support thresholds than CMDeo. Lastly, we report a successful application of the algorithm in a tutoring agent.     

Mining fuzzy association rules from questionnaire data

Association rule mining is one of most popular data analysis methods that can discover associations within data. Association rule mining algorithms have been applied to various datasets, due to their practical usefulness. Little attention has been paid, however, on how to apply the association mining techniques to analyze questionnaire data. Therefore, this paper first identifies the various data types that may appear in a questionnaire. Then, we introduce the questionnaire data mining problem and define the rule patterns that can be mined from questionnaire data. A unified approach is developed based on fuzzy techniques so that all different data types can be handled in a uniform manner. After that, an algorithm is developed to discover fuzzy association rules from the questionnaire dataset. Finally, we evaluate the performance of the proposed algorithm, and the results indicate that our method is capable of finding interesting association rules that would have never been found by previous mining algorithms.     

一种改进的并行挖掘关联规则的算法

发现关联规则是数据挖掘的一个重要的任务．简要介绍了几种发现关联规则的串行算法和并行算法，并针对IDD和HD这两种效率和可扩展性较好的算法，引入在线LPT调度算法，有效地解决了IDD和HD算法中非常重要的候选项目集在各个处理器节点之间的划分问题，尽可能使得各个节点负载平衡，从而提高算法的效率．     

一种提高并行数据挖掘效率的方法

发现关联规则是数据挖掘的一项重要任务，本文介绍了几种数据挖掘的串行和并行算法。其中IDD算法是一种高效的和易于扩展的发现关联规则的并行算法，然而，当处理嚣数目增加时，由于负载的失衡导致其效率的严重下降，于是通过引入近似算法成功地解决了这个问题。我们给出了两种近似算法和其性能证明，其一是在线算法，另一种是离线算法。在本文的最后，我们进行了改进的IDD算法的复杂性分析。     

关联规则的几种开采算法及其比较分析

关联规则的发现是数据开采的一个重要方面,目前有许多人正致力于关联规则的快速开采集法,本文介绍几种开采大型事务数据库中所有关联规则的算法,并比较它们的效率。     

On the adaptability of G3PARM to the extraction of rare association rules

To date, association rule mining has mainly focused on the discovery of frequent patterns. Nevertheless, it is often interesting to focus on those that do not frequently occur. Existing algorithms for mining this kind of infrequent patterns are mainly based on exhaustive search methods and can be applied only over categorical domains. In a previous work, the use of grammar-guided genetic programming for the discovery of frequent association rules was introduced, showing that this proposal was competitive in terms of scalability, expressiveness, flexibility and the ability to restrict the search space. The goal of this work is to demonstrate that this proposal is also appropriate for the discovery of rare association rules. This approach allows one to obtain solutions within specified time limits and does not require large amounts of memory, as current algorithms do. It also provides mechanisms to discard noise from the rare association rule set by applying four different and specific fitness functions, which are compared and studied in depth. Finally, this approach is compared with other existing algorithms for mining rare association rules, and an analysis of the mined rules is performed. As a result, this approach mines rare rules in a homogeneous and low execution time. The experimental study shows that this proposal obtains a small and accurate set of rules close to the size specified by the data miner.     

关系数据库中模糊规则的快速挖掘算法

关联规则和时序规则是数据挖掘的任务之一.在以往的算法中,规则通常用确定的数值或概念来表示,往往不具有实际意义,而且不容易被用户理解.研究了从大型关系数据库中挖掘模糊关联规则和模糊时序规则的问题.基于模糊集合的理论,提出了两个模糊关联规则的挖掘算法,然后把它们分别扩展为模糊时序规则的挖掘算法.用模糊概念表示的规则更符合人的思维和表达习惯,增强了规则的可理解性.