Found 426 Articles for Data Mining

How are decision trees used for classification?

Updated on 16-Feb-2022 11:44:47
Decision tree induction is the learning of decision trees from class-labeled training tuples. A decision tree is a sequential diagram-like tree structure, where every internal node (non-leaf node) indicates a test on an attribute, each branch defines a result of the test, and each leaf node (or terminal node) influence a class label. The highest node in a tree is the root node.It defines the concept buys computer, i.e., it predicts whether a user at AllElectronics is likely to buy a computer. Internal nodes are indicated by rectangles, and leaf nodes are indicated by ovals. There are various decision tree ... Read More

How does classification work?

Updated on 16-Feb-2022 11:43:32
Classification is a data-mining approaches that assigns elements to a set of data to aid in more efficient predictions and analysis. The classification is generally used when there are two target classes known as binary classification.When higher than two classes can be predicted, especially in pattern recognition problems, this is defined as multinomial classification. However, multinomial classification can be used for categorical response data, where one needs to predict which category amongst various elements has the instances with the largest probability.Data classification is a two-step phase. In the first phase, a classifier is built defining a predetermined collection of data ... Read More

How can we use rule constraints to prune the search space?

Updated on 16-Feb-2022 11:40:48
Rule constraints can be classified into the following five elements which are as follows −Antimonotonic − The first elements of constraints is antimonotonic. Consider the rule constraint “sum (I.price) ≤ 100”. Consider that it is using the Apriori framework, which at every iteration k analyze itemsets of size k. If the cost summation of the items in an itemset is no less than 100, this itemset can be shorten from the search space, because inserting more items into the set will only create it more costly and therefore will not satisfy the constraint.Pruning by antimonotonic constraints can be used at ... Read More

How are metarules useful in data mining?

Updated on 16-Feb-2022 11:37:34
Data mining is the process of finding useful new correlations, patterns, and trends by transferring through a high amount of data saved in repositories, using pattern recognition technologies including statistical and mathematical techniques. It is the analysis of factual datasets to discover unsuspected relationships and to summarize the records in novel methods that are both logical and helpful to the data owner.It is the procedure of selection, exploration, and modeling of high quantities of information to find regularities or relations that are at first unknown to obtain clear and beneficial results for the owner of the database.Data Mining is similar ... Read More

What is Constraint-Based Association Mining?

Updated on 16-Feb-2022 11:36:27
A data mining procedure can uncover thousands of rules from a given set of information, most of which end up being independent or tedious to the users. Users have a best sense of which “direction” of mining can lead to interesting patterns and the “form” of the patterns or rules they can like to discover.Therefore, a good heuristic is to have the users defines such intuition or expectations as constraints to constraint the search space. This strategy is called constraint-based mining.Constraint-based algorithms need constraints to decrease the search area in the frequent itemset generation step (the association rule generating step ... Read More

What are the steps involved in Association Rule Clustering System?

Updated on 16-Feb-2022 11:34:44
There are the following steps are involved in association rule clustering system which are as follows −Binning − Quantitative attributes can have a broad range of values representing their domain. It can think about how big a 2-D grid would be if it can plotted age and income as axes, where every possible value of age was created a specific position on one axis, and same, every possible value of income was created a specific position on the other axis.It can maintain grids down to a manageable size, it can instead partition the areas of quantitative attributes into intervals. These ... Read More

How can we mine closed frequent itemsets?

Updated on 16-Feb-2022 11:30:57
In naïve approach, it can mine the complete set of frequent itemsets and then remove each frequent itemset that is a proper subset of, and give the similar support as, a current frequent itemset.This method can derive 2100−1 frequent itemsets to obtain a length-100 frequent itemset, all before it can start to remove redundant itemsets. A recommended techniques is to search for closed frequent itemsets precisely during the mining phase. This needed us to prune the search area as soon as it can identify the method of closed itemsets during mining. There are various pruning strategies include the following −Item ... Read More

What is Apriori Algorithm?

Updated on 16-Feb-2022 11:26:46
Apriori is a seminal algorithm developed by R. Agrawal and R. Srikant in 1994 formining frequent itemsets for Boolean association rules. The algorithm depends on the case that the algorithm need previous knowledge of frequent itemset properties.Apriori use an iterative method called a level-wise search, where k-itemsets can explore (k+1)-itemsets. First, the set of frequent 1-itemsets is discovered by browsing the database to assemble the count for each item, and receiving those items that satisfy minimum support. The resulting set is indicated L1.Next, L1 can find L2, the set of frequent 2-itemsets, which can find L3, etc, until no more ... Read More

What are the criteria of frequent pattern mining?

Updated on 16-Feb-2022 11:24:16
There are several criteria of frequent pattern mining which are as follows −Based on the completeness of patterns to be mined − It can mine the whole collection of frequent itemsets, the closed frequent itemsets, and the maximal frequent itemsets, provided a minimum support threshold.It can also extract constrained frequent itemsets (It can satisfy a collection of user-defined constraints), approximate frequent itemsets (It can change only approximate support counts for the mined frequent itemsets), near-match frequent itemsets (It can count the support count of the relatively matching itemsets), top-k frequent itemsets (i.e., the k most frequent itemsets for a user-specified ... Read More

How is class comparison performed?

Updated on 16-Feb-2022 11:22:26
Class discrimination or comparison mines characterization that categorize a target class from its contrasting classes. The target and contrasting classes should be comparable providing they share same dimensions and attributes. For instance, the three classes, person, address, and elements, are not comparable. But the sales in the last three years are comparable classes, and so are computer science candidates versus physics candidates.The techniques developed can be continued to manage class comparison across multiple comparable classes. For instance, the attribute generalization process defined for class characterization can be changed so that the generalization is implemented synchronously between all the classes compared. ... Read More
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