Hi experts,

I just started to learn R today, and tried to work with an add-on  
package sem. I have a version of 2.3.1 on MacOS X 10.4.6 with sem put  
under /Library/Frameworks/R.framework/Versions/2.3/Resources/library

However when I typed

library(sem)

the following error showed up:

Error in library(sem) : 'sem' is not a valid package -- installed <  
2.0.0?

Why is this?

Thank you,
Gang Chen


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