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X-Validation - how is the division of examples done

Hello,
I have a question. How are the examples divided when using X-Validation?

For example, when I use X-Validation with 4 iteriations on the data of 100 examples, does it mean that

- first 75 examples will be for the learning purpose and the next 25 for testing in the 1 iteriation, then 1-25 and 51-100 will be for learning and 26-50 for testing... etc. OR

- the set for learning will be each time 75 and for testing 25, but examples in sets are chosen randomly?

Thank you in advance

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Cross Validation

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MartinLiebig

the first one.

the second one is similar to Bootstrap validation. But in Bootstrap validation you can have examples twice in the training set.

~Martin

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