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...Newton Raphson, I got problem with estimation, where it was too high" overestimation". Is there any one cen help me to know my problem when can be or recommend me to read some good references that can be useful? Best regards.  Below is the example,   cur=curd=cen=cens=array(1,100) Cur=RealCur=realcensoring=realcured=array(1,20) ExpCure=Bias=RealCure=array(1,21) ################################## Z1=c(rbinom(100,1,0.5)) Z2=c(rbinom(100,1,0.5)) dat1<-data.frame(time=rlnorm( 100,2,0.8),Censored=rbinom(100,1,0.9),Cured=rbinom(100,1,.3)) dat2<-dat1[order(dat1[,1]),] #...

Hi, I am trying to get the maximum likelihood estimator for lognormal distribution with censored data;when we have left, interval and right censord. I built my code in R, by writing the deriving of log likelihood function and using newton raphson method but my estimators were too high " overestimation", where the values exceed the 1000 in some runing of my code. is there any one can