Weibull++ Version 2022 Online Help
Gage R&R Folio Analysis Results
When accessed from a gage R&R folio, the Analysis
Summary window will contain detailed information about the
gage's precision.
If the current response data has been analyzed, you
can open the window by clicking the View
Analysis Summary icon on the control panel.
If the current response data has not been analyzed, the icon will still
be available so you can view the folio's analysis history.
Select an item in the Available Report Items panel to display it on
the spreadsheet. Each item is described next.
Analysis Results
The Analysis of Variance (ANOVA)
table provides general information about the effects of
the operator on the measurements.
ANOVA Table Columns
- Source of Variation
is the source that caused the difference in the measurements.
Part(Operator) is the part variation within operators,
and it is shown only for nested designs.
-
The number of Degrees
of Freedom is the number of regression coefficients
in the regression model for this source of variation.
- Sum of Squares
is the amount of difference in measurements caused
by this source of variation.
- Mean Squares
is the average amount of difference caused by this
source of variation. This is equal to Sum of Squares/Degrees
of Freedom.
- F Ratio
is the ratio of Mean Squares of this source of variation
and Mean Squares of pure error. A large value in this
column indicates that the difference in the output
caused by this source of variation is greater than
the difference caused by noise (i.e., this source
affects the output).
- P Value
(alpha error or type I error) is the probability that
an equal amount of variation in the measurements would
be observed in the case that this source does not
affect the output. This value is compared to the risk
level (alpha) that you specify on the Analysis Settings
page of the control panel. If the
p
value is less than alpha, this source of variation
is considered to have a significant effect on the
output. In this case, the term and its
p
value will be displayed in red.
The Gage Variance Results table
shows the variance and standard deviation of variance components.
Gage Variance Results Table Columns
- Source
is the source of variation in the measurements. Total
Gage R&R is the sum of Repeatability and Reproducibility,
and Total Variation is the sum of Total Gage R&R
and Part. Part(Operator) is the part variation within
operators and is shown for nested designs.
-
The Variance
Results section includes these columns:
- Variance
is a measure of how far the measurements are spread
out due to this source of variation.
- Variance
Contribution is the percentage of variance
that is due to this source of variation.
-
The Standard
Deviation section includes these columns:
- Standard
Deviation is the standard deviation that
is due to this source.
- Standard
Deviation Ratio (%) is the percentage of
the total standard deviation that is due to this
source.
- Study Variation
represents the spread of values that could result
from this source of variation. It is equal to
6 * the standard deviation.
- Study Variation
to Tolerance Ratio is the Study Variation
divided by the process tolerance specification
entered on the Analysis Settings page of
the control panel. Thus, a ratio of 100% means
the variation in measurements is equal to the
acceptable range of part values.