I am confused by the following description in
http://www.maths.lth.se/help/R/.R/library/systemfit/html/hausman.systemfit.html

what does the "Not run" mean? if we do not load systemfit, how can we run
the following code?

## Not run: library( systemfit )

data( kmenta )
attach( kmenta )
...

I install the package of systemfit, and run the code.
I got the warning:

> library( systemfit )
> data( kmenta )
> attach( kmenta )

        The following object(s) are masked from package:base :

         q

	[[alternative HTML version deleted]]


