| Downloads | 
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            PEN_0.99.0.tar.gz  
            R package for penalized estimation using folded concave penalty such as the Log penalty.
 
            PenPC_0.99.1.tar.gz  
              
           ( vignettes ) Use penalized regression method and a modified PC algorithm to construct DAG skeleton.
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  	 | Reference | 
    | Ha MJ, Sun W, & Xie, J (2014). PenPC: A Two-step Approach to Estimate the 
			Skeletons of High Dimensional Directed Acyclic Graphs. 
			arXiv preprint  arXiv:1405.1603
			
			 Download pdf 
 
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  	 | FAQ | 
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				Installation 
 R package PenPC requires package PEN for penalized estimation. Both packages can be installed from source code using the following command (in Mac Terminal window or Windows command window)
 
 R CMD INSTALL packageName
 
 Since the R package PEN contains C code, a C complier is required for installation.
 
 Please contact Min Jin Ha (mjha@mdanderson.org) if you have any questions.
 
 
 
 
 
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