# Technical information, K when you have a problem, K error messages – Casio FX-820MS User Manual

## Page 30

E-28

Regression Coefficient C =

**– 6.71629667 **

i**10 **

**–3**

A X r r 3 =

n

when

*x*

*i*

is 16 =

**–13.38291067**

16

A X r r r 3 =

m

1

when

*y*

*i*

is 20 =

**47.14556728**

20

A X r r r 1 =

m

2

when

*y*

*i*

is 20 =

**175.5872105**

20

A X r r r 2 =

**Data Input Precautions**

•

S

S

inputs the same data twice.

• You can also input multiple entries of the same data

using

A

G

. To input the data “20 and 30” five times,

for example, press 20

P

30

A

G

5

S

.

• The above results can be obtained in any order, and not

necessarily that shown above.

• Precautions when editing data input for standard devia-

tion also apply for regression calculations.

**Technical Information**

k **When you have a problem......**

If calculation results are not what you expect or if an error

occurs, perform the following steps.

1. Press

A

B

2

(Mode)

=

to initialize all modes and

settings.

2. Check the formula you are working with to confirm it is

correct.

3. Enter the correct mode and try performing the calcula-

tion again.

If the above steps do not correct the problem, press the

5

key. The calculator performs a self-check operation and

deletes all data stored in memory if any abnormality is

detected. Make sure you always keep written copies of all

important data.

k **Error Messages**

The calculator is locked up while an error message is on

the display. Press

t

to clear the error, or press

e

or

r

to display the calculation and correct the problem. See

“Error Locator” for details.