HP Prime Graphing NW280AAABA Fits the data to a logistic curve, Where L is the saturation value

To define your own fit

Fit type	Meaning (Continued)
Logistic	Fits the data to a logistic curve:
	L
	y = --------------------------
	1 + ae(–bx)
	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 = ax2+bx+c. Needs at
	least three points.
Cubic	Fits the data to a cubic
	polynomial:
	y = ax3 + b2x + cx + d
Quartic	Fits to a quartic polynomial,
	y = ax4 + bx3 + cx2 + dx + e
Trigonometric	Fits the data to a trigonometric
	curve: y = a ⋅ sin (bx + c) + d .
	Needs at least three points.
User Defined	Define your own fit (see below).

1.PressYto 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 Fitn field.

6.Enter an expression and press E. The independent variable must be X, and the expression must not contain any unknown variables. Example:

1.5⋅ cos (x) + 0.3 ⋅ sin (x) . Note that in this app, variables must be entered in uppercase.

232 Statistics 2Var app