How can I exclude effects from my DOE++ analysis?
There may be effects of factors or factorial interactions that
you wish to exclude from your Design of Experiments (DOE)
analysis, based either upon prior knowledge or upon initial
analysis. To do this in
Select Effects from the Data menu or click the
Select Effects icon in the Design tab or Analysis tab
In the Effects window, you can
specify for each response which main effects and interaction
effects you want to include in the model.
To make changes for the
response currently selected in the Response drop-down,
Select or clear individual
checkboxes to include/exclude individual effects.
Select or clear the checkbox in the Effect Name header to
include/exclude all effects.
Use the Limit by Order
drop-down to specify the order of effects you want to
include in the model.
For example, if you select
"Main Effects," only the individual effects of the factors (e.g.
A, B, C...) will be included. If you select "Order 3 Effects,"
the model will include the main effects, the second order
AB, AC, BC...) and the third order effects (e.g. ABC...).
The options available in this drop-down menu will vary depending
on the design and the number of factors. Response surface method
designs allow you to choose among linear, interaction and/or
quadratic effects. You can apply your changes to all responses
instead of just the one currently selected by clicking the
Apply to All Responses button.
Note, however, that when the
Effects window is accessed from the Analysis tab, the choices
you make will be applied only to the response currently selected
in the Control Panel. The Response
drop-down menu and the Apply to All Responses button will
How can I display probability scales on the probability plots in
Probability scales allow the user to read parameter estimate
values directly from the probability plot. In
Weibull++ 7, the
probability scales are toggled on and off in the Show/Hide Plot
Items window, which is accessed by selecting Show/Hide Items
from the Plot menu or the shortcut menu that appears
when you right-click inside the plot area.
of the probability scales can be changed on the Lines page of
the Plot Setup window, which is accessed by selecting Plot
from the Plot menu or shortcut menu or by clicking the
Plot Setup icon.
In the Name
field on the Lines page, select Other from the first
drop-down and then Probability Scales from the second
drop-down, as shown next.
In the Show area, you can select
whether to show the scales and/or the bars for the probability
scales. You can specify the color, thickness and style for the
probability scale lines and the color and pattern of the fill
for the probability scale bars using the options on this page.