Click here to see the SAS code.
Click here to see the example.

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This is a slight variation/enhancement of an example I found in
the following blog

It loops through a macro and builds a successively larger 
data set (more variables & observations), and runs a regression
analysis using several different procs.

Then another macro parses the log file, and gets the performance 
data (cpu-time, and real-time) for each run, and plots the 
real-time on a graph (since the real time is what's important,
and it's difficult to compare cpu time since some procs are
multi-threaded and some are not).

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