CROSS VALIDATION - VALIDATION COLUMN METHOD
When using the validation column method for cross validation , we split the data set into training , validation and test sets. This split ratio is specified by the user. Is there any guideline /reference to decide on the split ratio (such as 60:20:20 / 70:15:15 / 50:25:25 / 80 :10:10). Is it chosen also based on the total number of observations -N ?