HP 38g Graphing Calculator - Manual (Page 121)

Fit Models Reeression
Hi
Meanine
Linear (Default.) Fits the data to a straight line,
y = mx+b. Uses a least-squares fit.
m*x+b
Logarithmic Fits to a logarithmic curve, y = m\nx + b.
m*LN(X)+b
Exponential Fits to an exponential curve, y = be"“.
EXP{m*X)*b
Power Fits to a power curve, y =
X''m*b
Quadratic Fits to a quadratic curve, y = ax? +bx+c.
Needs at least three points.
a*X''2+b*X+c
Cubic Fits to a cubic curve, y = ax^ +b^ +cx+d
Needs at least four points.
a*X''3+b*X''2 + c*X+d
Logistic
Fits to a logistic curve, y =-------- ^V tt .
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.
L/ (l + a*EXP(-b*X) )
User Defined Define your own expression (in Symbolic
view.)
Statistics 5-15