Weka not recognizing attribute in "date" format

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I have a treatment and testing suite that I created with a Java program.

In the headline, it’s like this:

*@attribute data date "yyyy-MM-dd"*

And among other attributes.

An example of a data line is:

*@data

"2014-01-02",11.27,11.44,11.03,11.18,11.07,11.07,11.12,9419,2003400,2240946600,1*

But the strange thing is that when I open the file .arff in Weka, the date is classified bizarrely, the generated graph of the attribute data between intervals nothing to do with 138862800000 and 1419904800000.

As a result, I cannot classify this set correctly, or it plays everything as class 1 or class 2.

How do I arrange the date?

java date weka

  • Hello Thiago, have you had any success? managed to solve the problem? I’m starting my studies with Weka.

2 answers

1

It is in the format of milesseconds, if you click Edit you will probably see the correct date formatting, basically it is a float type, and this is because WEKA works with numerical values. To get around this, you should perform a data transformation through the Changedateformat filter (filters->unsupervised->attribute->ChangeDateFormat), choose the index of the attribute(attributeIndex) and the format (dateFormat), then click Ok and Apply. To finish apply the filter NunericToNiminal to convert the data to the nominal type.

0

All right? Dude, Weka is going to show the date timestamp on that home screen. Try running something over your dataset, and see how it behaves. For example: Run a forecasting, see that it will display the dates normally, as in the specified ARFF file. If it still doesn’t work, update the question with the function you are trying to use.

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