<Para ID="Par1">For a linear regression model subject to left-truncation and right-censoring where the truncation and censoring points are known constants (or always observed if random), Karlsson and Laitila (Stat Probab Lett 78:2567–2571, <CitationRef CitationID="CR3">2008</CitationRef>) proposed a semiparametric estimator which deals with...</citationref></para>

This note provides a new expression for the variance of the trimmed mean in terms of product moments of order statistics. An exact expression for the bias of the estimator of the variance of trimmed mean is also provided. As an illustration, exact calculations are carried out for small samples...