Computed Statistics - HP 39gII User Manual

To define your
own fit

Computed statistics

Statistics 2Var app
Fit model
Logistic
Quadratic
Cubic
Quartic
Trigonometric
User Defined
1. Display the Symbolic view.
2. Highlight the Fit expression (Fit1, etc.) for the
desired data set.
3. Type in an expression and press
independent variable must be X, and the expression
must not contain any unknown variables.
Example:
×
1.5
When you press
available. By default, the statistics involving both the
independent and dependent columns are shown. Press
to see the statistics involving just the independent
column or to display the statistics derived from the
Meaning (Continued)
Fits to a logistic curve,
L
y = ------------------------- -
– (
bx
+
1 ae
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.
Fits to a quadratic curve,
+bx+c. Needs at least
2
y = ax
three points.
Fits to a cubic polynomial,
3 2
y = ax + b x
Fits to a quartic polynomial,
4 3
= +
y ax bx
Fits to a trigonometric curve,
⋅ (
=
y a sin bx
at least three points.
Define your own expression (in
the Symbolic view.)
E
.
×
+
cos x 0.3 sin x
, there are three sets of statistics
)
+ cx + d
2
+ + +
cx dx e
. Needs
)
+ +
c d
. The
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