Version 1.4.4	July 7, 2012. 
	A new algorithm is implemented to calculate the variance of CPE for tied variables, which is more accurate than that in the previous version. 
Version 1.5.1   September, 2018
	Update maintainer's information
Version 1.5.2	January, 2022
	fixed a compiling error caused by function error(), which was
	undefined in the new version of R.  Replace error() with Rprintf()
	
	
