Study of the performance of a resolution criterion to characterise complex chromatograms with unknowns or without standards

Validation of peak prominence (which does not need standards) versus peak purity (an ideal criterion using standards) based on the agreement of Pareto fronts.

Consumer segmentation based on food-related lifestyles and analysis of rabbit meat consumption

Market segmentation divides the market into small groups of consumers who share similar characteristics. As all consumers within the same group have a common profile, marketing strategies can be adapted to target a specific type of consumer. Owing to the rapid changes in today’s society, consumer lifestyle has become the ideal criterion for market segmentation. In this study, we employed the food-related lifestyle model, which scholars have shown to be suitable and valid in several countries. Using data from a survey (with 3.53% error), we segmented the Spanish food market based on consumers’ food-related lifestyles. For each segment, we identified the consumer profile and analysed consumers’ consumption of rabbit meat. Factor analysis and cluster analysis yielded 4 segments: (i) ‘Unconcerned’ (36.8% of the sample) mainly consists of male consumers. Consumers in this segment value neither the freshness nor the price/quality ratio of their food items and consume rabbit meat rarely (39.4%) or sporadically (29.3%). (ii) ‘Cooks’ (18.4%) predominantly consists of middle-aged women. Consumers in this segment are highly demanding and critical of the quality of food products. They like cooking and are regular consumers of rabbit meat (40.6%). (iii) ‘Out-of-home consumers and convenience shoppers’ (28.6%) mostly consists of consumers aged between 25 and 34 y old and contains a large proportion of upper-class consumers. Consumers in this segment prefer to eat out and consume convenience products. This segment has the second highest percentage of regular consumers of rabbit meat (36.9%). The segment also has the second highest percentage of consumers who rarely or never eat rabbit meat (43.9%). (iv) ‘Rational purchaser with little interest in cooking’ (16.2%) has the highest proportion of consumers aged 55 to 74 y old. Consumers in this segment have the least interest in cooking, the most interest in the purchasing process, and the lowest consumption of rabbit meat (51.1% consume little or no rabbit meat).

An Interactive Procedure to Solve Multi-Objective Decision-Making Problem: An Improvment to STEM Method

Decisions in the real-world contexts are often made in the presence of multiple, conflicting, and incommensurate criteria. Multiobjective programming methods such as multiple objective linear programming (MOLP) are techniques used to solve such multiple-criteria decision-making (MCDM) problems. One of the first interactive procedures to solve MOLP is STEM method. In this paper we try to improve STEM method in a way that we search a point in reduced feasible region whose criterion vector is closest to positive ideal criterion vector and furthest to negative ideal criterion vector. Therefore the presented method tries to increase the rate of satisfactoriness of the obtained solution. Finally, a numerical example for illustration of the new method is given to clarify the main results developed in this paper.