BACKGROUND Driving a taxicab remains one of the most dangerous occupations in the United States, with leading homicide rates. Although safety equipment designed to reduce robberies exists, it is not clear what effect it has on reducing taxicab driver homicides. FINDINGS Taxicab driver homicide crime reports for 1996 through 2010 were collected from 20 of the largest cities (>200,000) in the U...

A distance mean function measures the average of points from elements a given set (focal set) in space. The level sets are called generalized conics. In case infinite focal is typically by integration over set. paper contains survey on applications taxicab functions and conics’ theory geometric tomography: bisection reconstruction problems coordinate X-rays. theoretical results illustrated impl...

This paper studies how firms reorganize following diversification, proposing that firms use outsourcing, or vertical disintegration, to manage diseconomies of scope. We also consider the origins of scope diseconomies, showing how different underlying mechanisms generate contrasting predictions about the link between within-firm task heterogeneity and the incentive to outsource following diversi...

distances Different distances between two given vectors Description These functions are used for calculating different distances between two given vectors. Thus, L1.dist calculates the L1 distance, cosin.dist calculates the cosine distance, euclidian.dist computes the Euclidian distance, and rank.cor.dist computes the rank correlation distance. The vectors have to have same length. When using r...

Qian, Xinwu, "Big data analytics with NYC taxicab data" (2014). Open Access Theses. 669.

The Canberra distance is the sum of absolute values of the differences between ranks divided by their sum, thus it is a weighted version of the L1 distance. As a metric on permutation groups, the Canberra distance is a measure of disarray for ranked lists, where rank differences in top positions need to pay higher penalties than movements in the bottom part of the lists. Here we describe the di...

For z1, z2, z3 ∈ Z, the tristance d3(z1, z2, z3) is a generalization of the L1-distance on Z to a quantity that reflects the relative dispersion of three points rather than two. A tristance anticode Ad of diameter d is a subset of Z with the property that d3(z1, z2, z3) 6 d for all z1, z2, z3 ∈ Ad. An anticode is optimal if it has the largest possible cardinality for its diameter d. We determin...

TOPSIS is a multicriteria decision making technique based on the minimization of geometric distances that allows the ordering of compared alternatives in accordance with their distances from the ideal and anti-ideal solutions. The technique, that usually measures distances in the Euclidean norm, implicitly supposes that the contemplated attributes are independent. However, as this rarely occurs...

In this work, Voronoi diagrams, Fortune algorithm and diagrams in the Taxicab plane are investigated.