HP 33S Owner's Manual

11–12 Statistical Operations
File name 33s-E-Manual-1008-Publication(1st).doc Page : 386
Printed Date : 2003/10/8 Size : 13.7 x 21.2 cm
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×


Views
Σ
x register.
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Leaves VAR catalog.
The Statistics Registers in Calculator Memory
The memory space for the statistics registers is automatically allocated (if it doesn't
already exist) when you press
/
or
-
. The registers are deleted and the
memory deallocated when you execute
¹ ¡
{

}.
If not enough calculator memory is available to hold the statistics registers when
you first press
/
(or
-
), the calculator displays
 
. You will
need to clear variables, equations, or programs (or a combination) to make room
for the statistics registers before you can enter statistical data. Refer to "Managing
Calculator Memory" in appendix B.
Access to the Statistics Registers
The statistics register assignments in the HP 33s are shown in the following table.
Statistics Registers
Register Number Description
n 28 Number of accumulated data pairs.
Σ
x
29 Sum of accumulated x–values.
Σ
y
30 Sum of accumulated y–values.
Σ
x
2
31 Sum of squares of accumulated x–values.
Σ
y
2
32 Sum of squares of accumulated y–values.
Σ
xy
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
e Ñ
and then storing the
summation (value
e Ò
). Similarly, you can press
º È Ò
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.

HP 33S Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Silver
Digits	10 digits
Display number of lines	2 lines
Keyboard type	Alphanumeric
Menus and prompts	Yes

Weight and Dimensions

Dimensions (WxDxH)	157 x 16 x 81 mm