Data Analysis Steps

Results and Conclusions

Click on the links below to start
Dataplot and run this case study yourself. Each
step may use results from previous steps, so
please be patient. Wait until the software
verifies that the current step is complete before
clicking on the next step.

The links in this column will connect you with more
detailed information about each analysis step from the case
study description.

1. Get set up and started.
1. Read in the data.

1. You have read 8 columns of numbers
into Dataplot: variables Y, X1, X2,
X3, X4, X5, X6, and X7.

2. Plot the main effects.
1. Ordered data plot.
2. DOE scatter plot.
3. DOE mean plot.

1. Ordered data plot shows 2 points
that stand out. Potential
important factors are X1, X2, X3,
and X7.
2. DOE scatter plot identifies X1, X2,
X3, and X7 as important factors.
3. DOE mean plot identifies X1, X2,
X3, and X7 as important factors.

3. Plots for interaction effects
1. Generate a DOE interaction
effects plot.

1. The DOE interaction effects
plot shows several important
interaction effects.

4. Block plots for main and interaction effects
1. Generate block plots.

1. The block plots are not
particularly helpful in
this case.

5. Youden plot to identify important factors
1. Generate a Youden plot.

1. The Youden plot identifies
X1, X2, X3, and X7 as important
factors. It also identifies a
number of important interactions
(X1*X3, X1*X2, X2*X3).

6. Effects plot to identify important factors
1. Generate effects plot.

1. The effects plot identifies
X2, X7, X1*X3, X1, X3, X2*X3,
and X1*X2 as important factors
and interactions.

7. Halfnormal probability plot to
identify important factors
1. Generate halfnormal probability
plot.

1. The halfnormal probability plot
identifies X2, X7, X1*X3, X1, X3,
X2*X3, and X1*X2 as important
factors and interactions.

8. Cumulative residual standard
deviation plot
1. Generate a cumulative residual
standard deviation plot.

1. The cumulative residual standard
deviation plot results in a model
with 4 main effects and 3 2factor
interactions.

9. DOE contour plot
1. Generate a DOE contour plot using
factors 2 and 7.

1. The DOE contour plot shows
X2 = 1 and X7 = 1 to be the
best settings.
