The minimum sum-of-squares clusering is the most widely used clustering method. The minimum sum-of-squares clustering is usually solved by the heuristic KMEANS algorithm, which converges to a local optimum. A lot of effort has been made to solve such kind of problems, but a mixed integer linear...

Estimating missing judgements is a key component in many multi-criteria decision making techniques, especially in the Analytic Hierarchy Process. Inspired by the Koczkodaj inconsistency index and a widely used solution concept of cooperative game theory called the nucleolus, the current study...

A cikkben bemutatunk egy módszert országok (vagy egyéb kockázatközösségek) halandósági mintázataik alapján történő csoportosítására (klaszterezésére). A bemutatandó módszer a görbék klaszterezésén alapul, ami viszonylag új területnek számít az adatelemzésben. A...

Incomplete pairwise comparison matrices contain some missing judgements. A natural approach to estimate these values is provided by minimising a reasonable measure of inconsistency after unknown entries are replaced by variables. Two widely used inconsistency indices for this purpose are...

In this paper a brief summary of the estimators for probability of death is given. Three estimators will be investigated, two of them are parametric ones. To derive a parametric estimator a distribution has to be assumed. Unfortunately the distributions occurring in real life differ from these...

Purpose: To compare the effectiveness for the patient of retrobulbar anaesthesia (RBA) and topical anaesthesia (TA) in cataract surgery by phacoemulsification. Methods: We performed a prospective, randomized study on 115 patients operated at our clinic using the two anaesthesia techniques. The...

Improving the ATM cash management techniques of banks has already received significant attention in the literature as a separate optimisation problem for banks and the independent firms that supply cash to automated teller machines. This article concentrates instead on a further possibility of...

In the paper, we investigate the pricing behavior of a risk averse monopoly. Since the focus is on the risk averse attitude of the firm, we ignore cost in our model. Demand is considered to be stochastic demand: as price decreases, the expected number of customers increases, but it has a...

A halandósági adatok elemzése nagy múltra tekint vissza a matematikai statisztikában. Több módszer is ismert, melyekkel elemezni vagy tesztelni lehet két vagy több sokaság túlélési valószínűségének azonosságát. A kockázatközösségek halandósági szempontból való...