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HP HP-11C - Page 58

HP HP-11C
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56
Section
3:
Numeric
Functions
When
you
press
the
key,
the
following
statistics
are
placed
in
theindicated
data
storage
registers:
Register
Contents
Ro
n
:Number
of
data
points
(pairs)
accumulated.
(n
also
appears
in
the
displayed
X-register.)
R4
2x
:Summation
of
x
values.
R,
3x2
:
Summation
of
squares
of
x
values.
R3
Yy
:Summation
of
y
values.
R4
Sy?2
:
Summation
of
squares
of
y
values.
Rg
3xy
:Summation
of
products
of
x
and
y
values.
When
you
execute
+],
the
number
previously
in
the
X-register
is
placed
in
the
LAST
X
register
and
the
updated
n-value
is
placed
in
X.
The
number
previously
in
the
Y-register
is
not
changed.
T
zZ+
Y
X+
Keys
LAST
X
When
you
key
in
a
new
number,
the
n-value
in
the
displayed
X-
register
will
be
written
over;
the
stack
does
not
lift.
If
your
statistics
problem
involves
only
one
variable
(x)
instead
of
two
(x
and
y),
ensure
that
the
Y-register
holds
zero
for
each
execution
of
the
function.
(Pressing
CLEAR
once,
just
before
beginning
a
new
accumulations
series,
ensures a
clear
Y-
register
for
a
one-number
series by
clearing
the
stack
as
well
as
the
3
registers
(Ry
through
Ry).
Some
sets
of
data
points
consist
of
a
series
of
x-values
(or
y-values)
that
differ
from
each
other
by
a
comparatively
small
amount.
You
can
maximize
the
precision
of
any
statistical
calculation
involving

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