ARFF File
Attribute Relationship File Format (ARFF) is the text format file used by Weka to store data in a database. This kind of file is structured as follows ("weather" relational database):
- @relation weather
- @attribute outlook {sunny, overcast, rainy}
- @attribute temperature real
- @attribute humidity real
- @attribute windy {TRUE, FALSE}
- @attribute play {yes, no}
The ARFF file contains two sections: the header and the data section. The first line of the header tells us the relation name. Then there is the list of the attributes (@attribute...). Each attribute is associated with a unique name and a type. The latter describes the kind of data contained in the variable and what values it can have. The variables types are: numeric, nominal, string and date. The class attribute is by default the last one of the list. In the header section there can also be some comment lines, identified with a '%' at the beginning, which can describe the database content or give the reader information about the author. After that there is the data itself (@data), each line stores the attribute of a single entry separated by a comma.
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