![]() You only need to do this once with your dataset. Weka provides a handy tool to load CSV files and save them in ARFF. The CSV format is easily exported from Microsoft Excel, so once you can get your data into Excel, you can easily convert it to CSV format. Quotes may also be used to surround values, especially if the data contains strings of text with spaces. This is a simple format where data is laid out in a table of rows and columns and a comma is used to separate the values on a row. In fact, it is much more likely to be in Comma Separated Value (CSV) format. Your data is not likely to be in ARFF format. These default datasets distributed with Weka are in the ARFF format and have the. The format supports numeric and categorical values as in the iris example above, but also supports dates and string values.ĭepending on your installation of Weka, you may or may not have some default datasets in your Weka installation directory under the data/ subdirectory. ![]() Values in the raw data section that have a question mark symbol (?) indicate an unknown or missing value. in an ARFF file that start with a percentage symbol (%) indicate a comment. sepallength REAL) and there is a directive to indicate the start of the raw data (e.g. iris), there is a directive to define the name and datatype of each attribute (e.g. By clicking Continue you confirm your selection", click Contine to apply changes.You can see that directives start with the at symbol and that there is one for the name of the dataset (e.g.
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