HP Prime Graphing Calculator User Manual
Page 234
230
Statistics 2Var app
To define your
own fit
1. Press
Y
to display the Symbolic view.
2. For the analysis you are interested in (S1 through S5),
select the
Type
field.
3. Tap the field again to see a menu of fit types.
4. Select User Defined from the menu.
5. Select the corresponding
Fit
n
field.
6. Enter an expression and press
E
. The
independent variable must be X, and the expression
must not contain any unknown variables. Example:
. Note that in this app,
variables must be entered in uppercase.
Logistic
Fits the data 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.
Quadratic
Fits the data to a quadratic
curve: y = ax
2
+bx+c
. Needs at
least three points.
Cubic
Fits the data to a cubic
polynomial:
Quartic
Fits to a quartic polynomial,
Trigonometric
Fits the data to a trigonometric
curve: .
Needs at least three points.
User Defined
Define your own fit (see below).
Fit type
Meaning (Continued)
y
L
1 ae
bx
–
+
--------------------------
=
y
ax
3
b
2
x cx d
+
+
+
=
y
ax
4
bx
3
cx
2
dx e
+
+
+
+
=
y
a
bx c
+
sin
d
+
=
1.5
x
cos
0.3
x
sin
+