User Manual
Statistics
Curve Fitting
Exponential Curve Fit
Using the function of the HP-12C, a least squares exponential curve fit may
be easily calculated according to the equation y=Ae
Bx
. The exponential curve
fitting technique is often used to determine the growth rate of a variable such as
a stock's value over time, when it is suspected that the performance is non-linear.
The value for B is the decimal value of the continuous growth rate. For instance,
assume after keying in several end-of-month price quotes for a particular stock it
is determined that the value of B is 0.10. This means that over the measured
growth period the stock has experienced a 10% continuous growth rate.
If B>0, you will have a growth curve. If B
Examples of these are given below.
The procedure is as follows:
1. Press CLEAR .
2. For each input pair of values, key in the y-value and press
, key in the
corresponding x-value and press
.
3. After all data pairs are input, press
to obtain the correlation coefficient
(between ln y and x).
4. Press 1
0 to obtain A in the equation above.