CG304-en-EU v1.1 7/14
10
n
x
x
/
Statistical
Analysis
Considerations
The
meter
calculates
statistics
from
a
maximum
of
80
readings
(For
Group
1
through
Group
4,
a
maximum
of
400
readings
can
be
stored).
Note
that
readings
cannot
be
stored
when
in
DIRECT
mode.
However,
statistics
on
these
readings
can
still
be
calculated.
When
the
meter
is
powered
off
or
if
the
working
mode
is
changed
(in
the
programming
menu),
the
DIRECT
mode
statistics
will
be
lost.
The
following
statistical
values
can
be
calculated:
NO.:
Number
of
readings
AVG:
Average
value
Sdev.
:
Standard
deviation
(square
root
of
a
data
set’s
variance)
MAX:
Maximum
reading
MIN:
Minimum
reading
Statistical
Terms
Average
value
(
x
)
is
the
sum
of
readings
divided
by
the
number
of
readings.
Standard
Deviation
(Sdev)
The
sample
standard
deviation
is
a
statistic
that
measures
how
the
sample
value
is
distributed
around
the
sample
mean.
The
standard
deviation
of
a
set
of
numbers
is
the
root
mean
square
of
the
variance
S
2
The
variance
of
a
list
is
the
square
of
the
standard
deviation
of
the
list,
that
is,
the
average
of
the
squares
of
the
deviations
of
the
numbers
in
the
list
from
their
mean
divided
by
the(number
of
readings
‐
1
)
Variance:
S
2
=
)
1
/(
)
(
2
n
x
x
Standard
deviation:
S=
2
S
NOTE:
Use
the
DELETE
parameter
from
the
programming
menu
immediately
after
an
outlier
or
erratic
reading
has
been
taken.
Refer
to
the
Delete
function
in
Programming
Menu.
Storage
Capacity
Overflow
In
GROUP
mode,
if
the
storage
capacity
is
exceeded,
statistics
will
not
be
updated,
although
measurements
can
still
be
made.
If
the
memory
is
full,
subsequent
readings
will
not
be
included
in
the
statistics.
The
meter’s
display
will
show
“FULL”
(in
the
SINGLE
measurement
mode).
In
DIRECT
mode,
when
the
memory
is
full,
the
newest
reading
will
replace
the
oldest
reading
and
the
statistics
will
be
updated.
