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Data Mining Chapter 2 Input: Concepts, Instances, and Attributes. Kirk Scott. Hopefully the idea of instances and attributes is clear Assuming there is something in the data to be mined, either this is the concept, or the concept is inherent in this
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Recall that according to normalization, a truly one-to-one relationship can be stored in a single table
In theory, you might restrict your attention only to those rows where the classification was yes
The multiple instances belonging to one classification together actually form one example of the concept under consideration in such a problem
3. Interval = numeric values where the distance between them makes sense (support subtraction) but other operations do not
In practice, preparing the data can take more time and effort than doing the mining
The Weka or woodhen (Gallirallusaustralis) is a flightless bird species of the railfamily. It is endemic to New Zealand, where four subspecies are recognized. Weka are sturdy brown birds, about the size of a chicken. As omnivores, they feed mainly on invertebrates and fruit. Weka usually lay eggs between August and January; both sexes help to incubate.
In an ARFF file, a classification attribute, if there is one, is treated no differently than any others
In a 1-m, pk-fk join, the multiple sets are the rows of the many table which belong together because they share the same fk value
In data mining, it is possible that you would want to elicit information about children in general
The instances in the rows of the table representing game information will be multivalued
Note that in general, relational attributes, multivalued attributes, are not limited to 2 sets of values
The bag attribute has 4 (familiar) attributes describing the multivalued instances (of day):
In the body of the ARFF table, the multivalued entries are structured in this way:
The book’s ARFF table is shown in Figure 2.3 on the following overhead
Given some (x, y) space, suppose x is in the range 010 and y is in the range 0100
There are cases where nominal attributes can be reverse engineered back to numerics