  The Heuristic Rating Estimation Method enables decision-makers to decide
based on existing ranking data and expert comparisons. In this approach, the
ranking values of selected alternatives are known in advance, while these
values have to be calculated for the remaining ones. Their calculation can be
performed using either an additive or a multiplicative method. Both methods
assumed that the pairwise comparison sets involved in the computation were
complete. In this paper, we show how these algorithms can be extended so that
the experts do not need to compare all alternatives pairwise. Thanks to the
shortening of the work of experts, the presented, improved methods will reduce
the costs of the decision-making procedure and facilitate and shorten the stage
of collecting decision-making data.
