Statistics aplet
8-13
To define your
own fit
1. In Numeric view, make sure
is set.
2. Display the Symbolic view.
3. Highlight the Fit expression (
Fit1
, etc.) for the
desired data set.
4. Type in an expression and press
.
The independent variable must be
X
, and the
expression must not contain any unknown variables.
Example:
.
This automatically changes the Fit type (
S1FIT
, etc.) in
the Symbolic Setup view to User Defined.
Computed statistics
One-variable
Quadratic
Fits to a quadratic curve,
y = ax
2
+bx+c
.
Needs at least three
points.
Cubic
Fits to a cubic curve,
y = ax
3
+bx
2
+cx+d
.
Needs at least
four points.
Logistic
Fits to a logistic curve,
,
where
L
is the saturation value for
growth. You can store a positive
real value in
L
, or—if
L
=0—let
L
be
computed automatically.
User
Defined
Define your own expression (in
Symbolic view.)
Fit model
Meaning (Continued)
y
L
1
ae
bx
–
(
)
+
--------------------------
=
1.5
x
cos
×
0.3
x
sin
×
+
Statistic
Definition
N
Σ
Number of data points.
TOT
Σ
Sum of data values (with their
frequencies).
Summary of Contents for 39g+
Page 1: ...hp 39g graphing calculator user s guide H Edition 2 Part Number F2224 90001 ...
Page 62: ...2 22 Aplets and their views 5 Display the functions in numeric form ...
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