© ElektroPhysik
QuintSonic 7
178 von 184
21.2 Statistical Terms
The statistical evaluation will help you to assess the quality of your product.
Average (Mean)
The sum of single readings divided by the total number of readings.
x
x
n
Variance
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 minus 1).
1
)
(
)
var(
²
2
n
x
x
x
s
Standard Deviation
(STD. DEV.) s (s =
= sigma)
The sample standard deviation is a statistic that me
asures how “dispersed“ 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.
s
x
x
n
2
2
1
(
)
s
s
2
Variation coefficient (Var.-coeff.)
The variation coefficient is the standard deviation divided by the arithmetic mean. The variation
coefficient is indicated in percent.
K
s
x
var
%
100