The Score Plot graphs each component’s
calculated values in relation to the other
adjusting each value for the mean and
The Loadings Plot graphs the unrotated
loading matrix between the variables and
the components. The closer the value is to
1, the greater the effect of the component
on the variable.”
This isn’t all, however, as we can click
on the red arrow (hot spot) at the top bar
labeled ‘Principal Components on Correla-
tions, to get all of the options (Figure 4).
Of all of the options, I have found the
Scree plot and Scatterplot 3D to be the
most useful (Figures 5 and 6).
The break in the Scree curve at ‘ 2’ or ‘ 3’
tells us the optimal number of Principal
Components that are needed for optimal
separation of groups or variables. The
3D plot visualizes this for us. As was seen
above, there are many more options.
JMP has many advantages as both an
analysis and graphics software platform. It
is extensively used for science and business
applications, as well as engineering and technology. It is recommended that the reader
download a free 30-day evaluation copy and
see for themselves. Highly Recommended.
• $1,470 single license, commercial,
SAS Campus Drive, Building T.
Cary, NC 27513; 877-594-6567
John Wass is a statistician based in
Chicago, IL. He may be reached at
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