After removing the useless attributes, we are left with 640 attributes. When we retrain the Naive Bayes and J48 classifiers using this reduced dataset, we got the same accuracy as we got in A(d) that is before reducing the attributes. The accuracy of Classifiers on the reduced dataset: ⦁ Naive Bayes: Accuracy = 70.85% ⦁ J48: Accuracy = 72.95% As we can see the accuracy of both the classifiers is intact even after removing many attributes. Here we can observe that performance of both the classifiers remains same, it neither improves nor degrade, this proves that the removed attribute didn't contribute to the performance of both the classifiers and didn't help classifiers in classifying the instances. Thus, such dimensions should be …show more content…
⦁ As we can see the difference in plots of the attributes against the class variable for the highest ranked attributes(for example, pixel_14_15) and the lowest ranked ones(pixel_2_11), in the former plot we can see that if we select this attribute and split it using some value range then we will get more meaningful sub-datasets and we can use those sub-datasets to classify the instances however in the second case if select that attribute and try to split it, we will get impure data and we won't be able to classify data as almost all instances have similar value for pixel_2_11 attribute. Here, the first attribute has high information gain however the second attribute has 0 information gain. ⦁ It's not safe to remove all the attributes with Information gain as 0. We should remove the attributes with IG 0 and run the classifier to make sure that performance has not degraded by removing those attributes. For example, In classifier's result we can see the 'Incorrectly Classified Instances', we started removing the attributes with IG 0 and retrained the classifier with new dataset and checked the value of incorrectly classified instances to make sure that that value does not increase and if it does and even after removing more attributes it does not come back to global low value then we should retrieve those attributes back and remove only those attributes when we had lowest Incorrectly Classified
imaging application. This is because the crucial data required for the classification phase are derived at this stage. Feature extraction is the process of estimating
We can highlight some insight right away by just looking at table 1. A quick overview of the attributes’ path-worths values :
The class diagrams show the attributes, operation, class name sand also the associations that in this example is a bi-directional association with the multiplicity in each point where it can be:
An attribute is an arrangement that defines the property of an object, folder, or file. Attributes should more correctly be considered metadata because it is the settings of the specified object, folder or file.
We were instructed to use naive Bayes classifier for data classification but no certain variation was provided. Minding that the dataset that was provided contained continuous data, there was two obvious approaches available handle to the situation: 1- Use a variation of naive Bayes that handles continuous data which features Gaussian (normal) distribution or reconstructing the
In concept development, attribute defines as an inherent characteristic (Merriam-Wester.com). Attribute plays an important role in defining the concept and differentiate it from other concepts.
there are attributes that apply to some but not all instances of an entity type.
Compound classification which can combine a number of flow predictions to make more accurate classification.
Naïve Bayes is a classifier based on Bayes theorem, this classifier assumes that the result of an attribute value on a class is independent of the other attributes values.
(1) Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that:
In the second scenario Iris dataset, which is one of the most common standard datasets is used. It consists of four attributes, 150 training samples, 150 testing samples, three classes, and three outputs as shown in Tables (\ref{Table:DatasetDescription}). The results of this dataset are summarized in Table (\ref{Table:Results}).
Then, we can edit this dataset and open it to edit names for the attributes.
the dataset does this include? If you remove these cases, do the results change much?
In a database, a complete set of attributes for a single occurrence of an entity class is called
Now, all string attributes are ranked by the score Score(Ai) in descending order, which can help process analysts quickly identify a set of attributes for data extraction.