why the value of outlook in correlation matrix is “？”

Hi @AP,

This is because the value can only be calculated when the attributes are numerical or binominal. Outlook is Nominal, and hence a correlation can't be calculated.

Thanks,

Roland

“the value can only be calculated when the attributes are numerical or binominal. Outlook is Nominal, and hence a correlation can't be calculated.”—-why？

The statistical method of calculating correlations doesn't support categories, referred to as nominal in AI Studio.

Hope this helps,

Thanks,

Roland

“The statistical method of calculating correlations doesn't support categories”，but “binominal” is a kind of categories