2012-07-12  Sy Han Chiou <steven.chiou@uconn.edu>
	* Added Prentice-Wilcoxon weight
	* Sandwich variance estimator for multivariate

2012-06-21  Sy Han Chiou <steven.chiou@uconn.edu>
	* For aftgee function, added lsonly switch.

2012-06-18  Sy Han Chiou <steven.chiou@uconn.edu>
	* Added case-cohort weights for aftgee function.
	* Fixed prepX function
	* Fixed interception issue
	* Added warnings

2012-06-06  Sy Han Chiou <steven.chiou@uconn.edu>
	* Replace "nfsane" by "BBsolve"
	* Output whether An is invertible 

2012-05-19  Sy Han Chiou <steven.chiou@uconn.edu>
	* Added closed form variance estimation, zlc, hc, isc, for "logrank"

2012-05-15  Sy Han Chiou <steven.chiou@uconn.edu>
	* Added converage at output

2012-05-15  Sy Han Chiou <steven.chiou@uconn.edu>
	* Added "logrank" weight
	* Package depend on library(BB)
	* Variance estimation for "logrank" fixed for "mult", "zle" and "ise".

2012-05-07  Sy Han Chiou <steven.chiou@uconn.edu>
	* Huang's approach with non smoothed estimating equation does not seem to have a converaged solution, this might due to the scales/order.
	* SiFun, sfun, etc are modiflied based on our paper. 

2012-05-04  Sy Han Chiou <steven.chiou@uconn.edu>
	* Huang's approach with smoothed estimating equation.
	* Zeng and Lin with non smoothed estimating equation.

2012-05-01  Sy Han Chiou  <steven.chiou@uconn.edu>
	* Intend to add log-rank weight.
	* H and ZL on non-smoothed estimating equation.

2012-04-22  Sy Han Chiou  <steven.chiou@uconn.edu>
	
	* Modified aftgee.est so that margin can be at no specific order.
        * Added nwtco example.
  
