6. Measurement Using Statistics
The gauge calculates statistics from a maximum of 80 readings
(GR01~GR04: in total, a maximum of 400 readings can be stored),
In addition, readings can't be stored in DIR mode, but it can calculate
statistics as GR01~GRQ4. When power off or changing Work Mode (see
MENU system for details), the DIR statistics will be lost. The following
statistical values are calculated:
NO.: Number of readings in Work Mode.
AVG: Average value.
Sdev. : Standard deviation.
MAX: Maximum reading.
MIN: Minimum reading.
6-1.Statistical Terms
Average value(
Ẋ
)
The sum of readings divided by the number of readings.
Ẋ
=
∑
x/n
Standard Deviation (Sdev.)
The sample standard deviation is a statistic that measures how "spread
out" the sample is around the sample mean. The sample standard
deviation increases with increasing spread out. The standard deviation of
a set of numbers is the root mean square of the variance S2
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
=
∑
(x-
ẋ
)
2
/(n-1)
Standard deviation S=
Ѵ
S
2
NOTE
:
Deletion must take place immediately after an outlier or erratic reading
has been taken. See the Delete function in MENU system.
6.2.Storage Capacity Overflow
-In GROUP mode, if the storage capacity is exceeded, statistics will not
be updated, although measurement can continue. If the memory is full,
subsequent readings will omitted from the statistics. They will be marked
with "FULL" in LCD (in single measuring mode).
-In DIRECT mode, if the memory is full. The newest reading will replace
the oldest reading. And the statistics will be updated.
