HOW CAN WE DIVIDE HUGE DATA INTO TRAINING TESTING ,AND VALIDATION FOR EXAMPLE 60%,25%AND 15 % AND GIVING THE FILTER CODE OF 1,0,-1 FOR TRAIN,TEST AND VALIDATION GROUPS . THEIR IS AMETHOD OF CLUSTER BUT IT DOES NOT GIVE US DESIRED DIVISION USING SPSS SOFTWARE V26 AND IT RECODE TO 1,2,3 SO WE MUST REPLACE VALUE AND THANK YOU IN ADVANCE, PLEASE SHOW ME THE STEPS CLEARLY WITH DETAILS OF SELECTION.