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Specific Features of the HP-33E
27
Correlation Coefficient
To establish
how welilhe data used fits the linear
regression, you
may
want
to
calculate the correlation coefficient, r,
by
using
0
(correlation
coefficient).
The correlation coefficient is a value between
-
1
and
I
.
AI
r
=
0 you
have no
fit. while at r
=
±
1 you
have a
perfect
fit.
Exam
p le:
Calcu late
the correlation
coeffic
ient for the previou
sly
calculated
linear regression
.
Keystrokes
IIlIIl
Display
0.9967
Vector Arithmetic
A
very good
fit.
You
ca
n use
your
HP-33E
to
add
or
subtract vectors by combining
the
polar/
rectangular
conversion functions
(the
00
~
and
the
[I)
~
keys)
with the
summation
functions
(the
[EJ
and
OJ(E]
keys).
To
use
Dilly
the
Ix and
I
y
that
you
have
accumu lated in
the storage
registers. you can press 1
RCl
l
followed
by
~.
Th
is brings
lx into the
displayed X-register and ly
into
the
Y
-register, overwriting
the
conten
ts
of
those
two
stack
registers.
The stack does not lift.
This
feature
is
particularly useful
when performing vector arithmetic.
Exam
ple:
On
hi
s
way
to
search
for an
a
lbino
ca
ri
bou.
grizz led
bus
h
pilot
Apeneck
Sweeney's converted Sword-
fish aircraft
has
a
true
air speed
of 150
knots
and an estimated
heading
of
45°.
The Swordfish
is also
being buf-
feted by a
head
wind of
40 knots
from a
bearing of
25°.
What
is
the
actual ground
speed
and
true
course
of the
Swordfish
?
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