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HP HP-20S - Page 108

HP HP-20S
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Program
Instructions:
1.
Press
[\
to
enter
Program
mode,
(9]
F
to
load
the
program,
and
[H]
to
exit
Program
mode.
Clear
the
statistical
registers
by
pressing
[(>]
[CLZ].
Select
the
desired
curve
fit
by
pressing
A
(power),
B
(exponential),
or
C
(logarithmic).
Enter
each
x,y
data
pair
(x
(INPUT]y)
and
press
[R/S].
The
total
number
of
data
pairs
is
displayed.
(If
you
get
an
error,
reselect
the
curve
fit.)
Optional:
To
delete
an
x,y
data
pair,
enter
x
y,
then
press
9.
The
total
number
of
data
pairs
is
displayed.
(If
you
get
an
error,
reselect
the
curve
fit.)
To
calculate
X
and
1,
enter
the
y-value
and
press
D.
X
is
displayed.
Press
[H]
to
see
.
To
calculate
§
and
1,
enter
the
x-value
and
press
E.
§
is
displayed.
Press
[¥]
to
see
r.
To
calculate
m
and
b,
press
F.
m
is
displayed.
Press
(«)
to
see
b.
Example:
Use
the
data
below
to
calculate
m,
b,
and
r
for
a
power
curve.
Estimate
y
for
an
x-value
of
37
and
x
for
a
y-value
of
101.
X
40.5 38.6
37.9
36.2
35.1
34.6
Y
104.5
102 100
97.5 95.5
94
Keys:
Display:
Description:
(#]
(#]
Fit
Loads
program.
F
00-
(]
Exits
Program
mode.
(]
0.0000
Clears
statistical
registers.
A
0.0000
Selects
power
curve
fit.
40.5
40.5000
Enters
x;.
106
7:
Built-in
Program
Library

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