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How can I compare data sets in Weibull++ 7?
Weibull++ 7
provides several ways to compare data sets.
From the drop-down menus in
the middle of the Comparison Wizard,
select the Standard Folio Data Sheets that contain the data
sets you would like to test. When you click Compare,
the message
box at the top of the page returns the results and the
Comments Box at the bottom of the page displays comments on
the test, as shown next.
- Plotting: The
MultiPlot allows you to place more than one data set on a
plot. Select Add Additional Plot then MultiPlot
from the Project menu to add a new MultiPlot to the
project. In the Select Folio/Data Sheet window that appears,
select the calculated Standard Folio Data Sheets or Warranty
Folio Data Sheets that contain the data sets you would like
to compare then click OK.
- Simple Plotting:
One popular graphical method for making this
determination involves plotting the data with
confidence bounds and seeing whether the bounds
overlap or separate at the point of interest. This
can be effective for comparisons at a given point in
time or a given reliability level, but it is
difficult to assess the overall behavior of the two
distributions, as the confidence bounds may overlap
at some points and be far apart at others.
- Contour
Plotting: By overlaying two contour plots from
two different data sets (analyzed using the same
distribution) at the same confidence level(s), you
can visually assess whether the data sets are
significantly different at the given confidence
level(s). If there is no overlap on the contours at
a particular confidence level, the data sets differ
significantly at that level. The disadvantage of
this method is that the same distribution must be
fitted to both data sets. In the figure shown next,
failure data from two designs have been
analyzed using the 2-parameter Weibull distribution.
There is an overlap at the 95% confidence level and
no overlap at the 90% confidence level, indicating
that the new design is better at the 90% confidence
level.
How can I obtain a picture of my Xfmea/RCM++ System or FMEA
Hierarchy that can be inserted into other documents?
Two recently-added options in
Xfmea and
RCM++ allow you to
quickly and easily obtain a picture of a portion of your System Hierarchy
Panel or FMEA Hierarchy Panel that can be inserted into other
documents:
-
Select Copy
System Panel as Graphic from the Edit menu to
copy the currently visible contents of the System Hierarchy
panel to the clipboard as a graphic
-
Select Copy
FMEA Panel as Graphic from the Edit menu to copy
the currently visible contents of the FMEA Hierarchy panel,
in either the hierarchy view or the worksheet view, to the
clipboard as a graphic.
The contents of the clipboard can
then be pasted into other applications, such as graphics editors
or Microsoft Word. Note that the entire visible area within the
System Hierarchy panel or FMEA Hierarchy panel will be copied
and that any items that are not currently visible will not be
copied.
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