HP HP-20S - Page 110

item Exponential Logarithmic
To start: (] [cLZ](XEQ] B (] (cL=][XEQ] C
m 0.0177 65.8446
b 51.1312 —139.0088
r 0.9945 0.9965
y (x = 37) 98.5870 98.7508
X (y = 101) 38.3628 38.2857
Remarks:
The message Error - Func is displayed if x; < 0 for logarithmic curves,
if y; < 0 for exponential curves, or if either x; or y; < 0 for power
curves. If you get an error (Error - Func), reselect the curve fit type by
pressing A, B, or C. Using valid data, repeat the operation that
caused the error.
Data values of large magnitude but relatively small differences can
cause problems in the precision of the calculated results, as can data
values of greatly different magnitudes.
If there is a pending expression when the data pairs are input, it is
evaluated before the data pairs are used for regression calculations.
108 7: Built-in Program Library