ABSTRACT
Censored samples occur frequently in life, fatigue, and reaction time tests where individual observations are time ordered and where tests are terminated with one or more survivors. Brief mention is made of estimation in the two-parameter distribution as a special case of the three-parameter distribution. This chapter deals with estimation in the three-parameter lognormal distribution from samples that are singly censored or singly truncated on the right. For truncated and censored samples, the estimating procedure is quite similar to that described in the preceding paragraphs for complete samples. When data from truncated or censored samples are grouped, estimating procedures differ from those employed with ungrouped data only with respect to summations involved in the estimating equations. The effect of grouping errors, however, can be minimized by resorting to the probit technique as outlined in connection with estimation from progressively censored samples.
