
I just joined this list, and I see in the archives that there have  
been several answers to this already, but I'll add another one:

 > install.packages(mosaic)

 > example(xpnorm)


xpnorm() is a function that behaves much like pnorm() but provides  
more verbose output and a plot to go with the lower "tail"  
probability.  If you run in RStudio, the last example will add a  
slider.  A fancier version of this will likely be available soon with  
a manipulate=TRUE option.

The plot is a bit crude at the moment and looks better in some window  
sizes than in others.  I happy to receive suggestions for  
improvement.   The current version of mosaic on CRAN is a beta  
release.  A new version should be there in a few days and we are  
working to have as stable, robust, and comprehensive a package as we  
can muster ready my JSM.

There are other x-functions in the package as well (xhistogram(),  
xchisq.test, etc.) that add extra features to the plain-vanilla  
functions without the initial x.

There are a number of other things in this package (and in the works)  
to aid in teaching statistics.  Perhaps in a future post we can say  
more about other things we are working on.  Watch for new between now  
and JSM or catch one of us there.

-----Randy Pruim (for Nick Horton and Danny Kaplan, co-conspiratoRs)



Begin forwarded message:

>> Date: Sat, 2 Apr 2011 14:12:05 -0700 (PDT)
>> From: Ali Zanaty <zanaty2005@yahoo.com>
>> To: r-sig-teaching@r-project.org
>> Subject: [R-sig-teaching] Plotting the P value
>> Message-ID: <940519.9371.qm@web59511.mail.ac4.yahoo.com>
>> Content-Type: text/plain
>>
>> Dear  All R users:
>>
>>
>>
>> Can someone help me with the plotting the p-values under the normal  
>> curve (say).
>>
>>
>>
>> Thank you so much.
>>
>>
>>
>> Ali


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