Current research has focused on whether nutrition labeling and pricing policies (i.e., soda taxes) influence food decisions; however, less attention has been given to how peers influence one’s food decisions. This study uses sales receipts from a full-service restaurant to take a closer look at how people order in groups. Results of the study revealed people may be less variety-seeking than pre...

. ABC analysis is one of the most widely used techniques in inventory management to classify items into three ordered categories called A, B and C, where category A contains the most important items and category C includes the least important ones. The ABC classification of inventory items is based on their performance expressed by weighted scores. In this paper, a new ABC classification model ...

We study representations of wreath product analogues of categories of finite sets. This includes the category of finite sets and injections (studied by Church, Ellenberg, and Farb) and the opposite of the category of finite sets and surjections (studied by the authors in previous work). We prove noetherian properties for the injective version when the group in question is polycyclic-by-finite a...

This study used a diffusion of innovations theoretical framework [Rogers, E. M. 2003. Diffusion of innovations. 5th edition. New York: The Free Press] to identify organizational-level predictors of a categorical typology of substance abuse treatment centers based on naltrexone adoption. Data from the National Treatment Center Study (N = 158) were used to examine the impact of socioeconomic stat...

Empirical studies on the relationship between income and happiness commonly use standard ordered response models, the most well-known representatives being the ordered logit and the ordered probit. However, these models restrict the marginal probability effects by design, and therefore limit the analysis of distributional aspects of a change in income, that is, the study of whether the income e...

We introduce object systems as a common generalization of graphs, hypergraphs, digraphs and relational structures. Let C be a concrete category, a simple object system over C is an ordered pair S = (V, E), ∗Research supported in part by Slovak VEGA Grant 2/4134/24. 282 J. Bucko and P. Mihók where E = {A1, A2, . . . , Am} is a finite set of the objects of C, such that the ground-set V (Ai) of ea...

Labelled Markov processes (LMPs) are automata whose transitions are given by probability distributions. In this paper we present a ‘universal’ LMP as the spectrum of a commutative C∗-algebra consisting of formal linear combinations of labelled trees. We characterize the state space of the universal LMP as the set of homomorphims from an ordered commutative monoid of labelled trees into the mult...

In this article we study a type of directed completion for posets and T0-spaces introduced by O. Wyler [Wy81] that we call the D-completion. The category D of monotone convergence spaces is a full reflective subcategory of the category of topological spaces and continuous maps, and the D-completion gives the reflection of a topological space into D, and as such exhibits a useful universal prope...

Disjunctive systems are a representation of L-domains. They use sequents of the form X ` Y , with X nite and Y pairwise disjoint. We show that for any disjunctive system, its elements ordered by inclusion form an L-domain. On the other hand, via the notion of stable neighborhoods, every L-domain can be represented as a disjunctive system. More generally, we have a categorical equivalence betwee...