For better guiding a system, senior managers should have accurate information. Using Data Envelopment analysis (DEA) help managers in this objective. Thus, many investigations have been made in order to find the most productive scale size (MPSS) for the evaluating decision making units (DMUs). In this paper we consider this case where there exist subsets of input and output variables to be inte...

This paper presents a new generalization of the Genocchi numbers and theorem. As consequences, we obtain some important families integer-valued polynomials those are closely related to Bernoulli polynomials. Denoting by ${(B_n)}_{n \in \mathbb{N}}$ sequence ${(B_n(X))}_{n polynomials, especially that for any natural number $n$, reciprocal polynomial $\big(B_n(X) - B_n\big)$ is integer-valued.

Abstract. Time series of counts arise when the interest lies on the number of certain events occurring during a specified time interval. Many of these data sets are characterized by low counts, asymmetric distributions, excess zeros, over dispersion, ruling out normal approximations. Several approaches and diversified models that explicitly account for the discreteness of the data have been con...

We propose a simple real-valued generalization of the well known integer-valued Erdös number as a topological, non-metric measure of the ‘closeness’ felt between two nodes in an undirected, weighted graph. These real-valued Erdös numbers are asymmetric and are able to distinguish between network topologies that standard distance metrics view as identical. We use this measure to study some simpl...