Data Mining: Practical Machine Learning Tools and Techniques, Second Edition

to all features of the system. When you fire up Weka you have to choose among four different user interfaces: the Explorer, the ...

Weka’s main graphical user interface, the Explorer, gives access to all its facili- ties using menu selection and form filling. ...

Preparing the data The data is often presented in a spreadsheet or database. However, Weka’s native data storage method is ARFF ...

interface choices at the bottom. (The others were mentioned earlier:Simple CLI is the old-fashioned command-line interface.) Wha ...

bring up a standard dialog through which you can select a file. Choose the weather.arfffile. If you have it in CSV format, chang ...

deviation. In this case the histogram will show the distribution of the class as a function of this attribute (an example appear ...

374 CHAPTER 10 | THE EXPLORER (a) (b) Figure 10.4Using J4.8: (a) finding it in the classifiers list and (b) the Classifytab. ...

10.1 GETTING STARTED 375 Relative absolute error 60 % Root relative squared error 97.6586 % Total Number of Instances 14 Correct ...

has been assigned to a particular leaf, followed by the number of instances that reach that leaf, expressed as a decimal number ...

Doing it again You can easily run J4.8 again with a different evaluation method. Select Use training set(near the top left in Fi ...

right-clicking an entry in the history list you can see the classifier errors. If the model is a tree or a Bayesian network you ...

10.1 GETTING STARTED 379 (a) (b) Figure 10.6Visualizing the result of J4.8 on the iris dataset: (a) the tree and (b) the clas- s ...

10.2 Exploring the Explorer We have briefly investigated two of the six tabs at the top of the Explorer window in Figure 10.3(b) ...

10.2 EXPLORING THE EXPLORER 381 This is a generic object editor, used throughout Weka for selecting and configuring objects. For ...

Files on your computer are not the only source of datasets for Weka. You can open a URL, and Weka will use the hypertext transfe ...

10.2 EXPLORING THE EXPLORER 383 10.3(b) but with only three attributes,humidity, windy,and play. At this point the fourth button ...

bution of the playattribute. Unfortunately, this display is impoverished because the attribute has so few different values that ...

10.2 EXPLORING THE EXPLORER 385 Figure 10.11 shows the output. The pruned model tree is simply a decision stump with a split on ...

+ 0.0016 * MMIN + 0.0034 * MMAX === Run information === Scheme: weka.classifiers.trees.M5P -M 4.0 Relation: cpu Instances: 209 A ...

10.2 EXPLORING THE EXPLORER 387 make sense for numeric prediction). Section 5.8 (Table 5.8) explains the meaning of the various ...