HP 33s User Manual
Page 156
11–12
Statistical Operations
Statistics Registers
Register
Number
Description
n
28
Number of accumulated data pairs.
Σx
29
Sum of accumulated x–values.
Σy
30
Sum of accumulated y–values.
Σx
2
31
Sum of squares of accumulated x–values.
Σy
2
32
Sum of squares of accumulated y–values.
Σxy
33
Sum of products of accumulated x– and
y
–values.
You can load a statistics register with a summation by storing the number (28
through 33) of the register you want in i (number
I
) and then storing the
summation (value
I
). Similarly, you can press
|
to view a
register value — the display is labeled with the register name. The SUMS menu
contains functions for recalling the register values. See "Indirectly Addressing
Variables and Labels" in chapter 13 for more information.