Casio fx-991ES PLUS User Manual

To select this type of statistical calculation:
(Regression formula shown in parentheses)
Press this key:
Single-variable (X) (1-VAR)
Paired-variable (X, Y), linear regression
(y = A + Bx)
(A+BX)
Paired-variable (X, Y), quadratic regression
(y = A + Bx + Cx
2
)
(_+CX
2
)
Paired-variable (X, Y), logarithmic regression
(y = A + Blnx)
(ln X)
Paired-variable (X, Y), e exponential
regression
(y = A e
Bx
)
(e
∧
X)
Paired-variable (X, Y), ab exponential
regression
(y = AB
x
)
(A•B
∧
X)
Paired-variable (X, Y), power regression
(y = Ax
B
)
(A•X
∧
B)
Paired-variable (X, Y), inverse regression
(y = A + B/x)
(1/X)
Pressing any of the above keys ( to ) displays the Statistics Editor.
Note
• When you want to change the calculation type after entering the STAT Mode, perform
the key operation (STAT) (Type) to display the calculation type selection
screen.
Inputting Data
Use the Statistics Editor to input data. Perform the following key operation
to display the Statistics Editor:
(STAT) (Data).
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Casio fx-991ES PLUS Specifications

General

Type	Scientific
Cover	No
Form factor	Desktop
Control type	Buttons
Product color	Gray
Digits	15 digits
Display type	Dot-matrix
Display resolution	96 x 31 pixels
Display number of lines	10 lines
Storage media type	Not available
Battery life	3 year(s)
Battery type	LR44
Power source	Battery/Solar
Number of batteries supported	1
Symbolic notation	Square root
Conversion between	Decimal, Fraction, Percent
Convert angles from degrees to	Gradian, Radian
Random number/integer generator	Yes

Weight and Dimensions

Depth	162 mm
Width	80 mm
Height	11.1 mm
Weight	95 g