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 tell me where the error can be and help me in how I can get the estimators with right way?.
 kind regards 
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