Databases Reference
In-Depth Information
Figure 2.21
Filter Means Only
Now instead of one line sequence for each observation in the filter group, you
see one line sequence representing the mean values for each filter group and can
readily compare one group to the other (Figure 2.21).
Exercise 2.4
Use the VisMiner parallel coordinate plot to answer the questions below with
respect to the OliveOil dataset. To keep the region and area names from
being obscured by the plot lines, it is best to drag the AreaName axis all the
way to the right and to drag the RegionName axis next to it on the left.
Flatten both axes.
a. Create separate filters for each of the three regions. Which areas belong to
the South region; which areas belong to the North region; which areas
belong to the Sardinia region?
b. Use the PCP to develop classification rules to assign observations to a
Region similar to what you did in exercise 2.3c. Hint: Open a second PCP
with all observations belonging to the default initial filter group. Using the
first PCP (with the three separate filter groups) as a guide, adjust the acid
sliders in the second PCP to eliminate all observations belonging to the
South region without eliminating any belonging to the other two. You can
tell if you have accomplished this when there are no line segments
connecting to the South region and the number of remaining observations
