Hello Richard, I am glad you got your problem solved. I just want to point out that if you need to calculate the cumulative frequency, the program in page 18-9, like other programs in the user guide, is way too complicated that it has to be; here it is a program that execute the same task and it is not so complicated (The frequency vector should be in level 1:).
« { 0 } 1 PICK3 SIZE HEAD
FOR j
OVER j GET
OVER j GET
+ +
NEXT TAIL
»