Size Error when entering statistics

[TheDude]

I want to do a linear fit.

I have the calculator in STAT > All mode

I enter first y value, ENTER, first x value.

Press STAT > Sigma+

---> Size Error

What am I missing?!?

[Thomas Okken]

Size Error means you're trying to access a numbered register that doesn't exist. The numbered registers are stored in a matrix named REGS; if that matrix is too small, or missing entirely, this error may occur.

The statistics summations are kept in numbered registers; by default, they are in registers 11 through 23. If you do SIZE 0025, you will restore REGS to its default size, and the statistics functions will work again. (The SIZE function is in the MODES menu.)

[TheDude]

SIZE 0025 fixed the issue. 

Thanks a lot for the excellent support. I would never have figure that out.