Hioki RM2610 - What Are Analysis Results

102
What are analysis results?
8.8 What are analysis results?
Analysis reliability provides an indicator of whether the inverse problem was performed correctly.
Although the value is not intended to serve as an indicator of the absolute value or accuracy of the
interface resistance or composite layer volume resistivity, it does offer a way to check the status of
analysis.
Two types of analysis results are provided:
Iteration number [iterations]
The iteration number indicates the number of inverse analysis iterations. Ordinarily, there is no
relationship between the number of iterations until analysis completes and the correctness of the
analysis results, and the iteration number can be thought of as varying with the manner in which
the initial value was calculated and the reduction factor setting. Please use the iteration number as
a rough indicator of calculation time.
Coincidence between observed potential and calculated potential (coefcient of
determination)
The coincidence value expresses the extent to which the calculated potential distribution
approaches the observed potential distribution. The more closely this value approaches 1, the
smaller the relative difference between the measured potential and the calculated potential (i.e., the
greater their relative coincidence). Coincidence [R
2
] is dened as follows (it may have a negative
value):
R
VV
VV
meas icalci
i
meas i
i
2
2
2
6
5
=
−
−
∑
∑
()
()
,,
,
1−
Here V
meas.i
indicates the measured potential; V
calc.i
, the calculated potential; and V
―
, the average
measured potential distribution.