Fit models – HP 38g Graphing Calculator User Manual
Page 121
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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