Statistical Evidence of Mortgage Redlining? A Cautionary Tale

Statistical analyses of mortgage redlining at the neighborhood level have fueled the debate over the existence of racial redlining in mortgage lending, both "proving" and "disproving" that redlining exists, depending upon the type of model used. In this paper, we compare results of different statistical models using data for the Washington, DC metropolitan area to determine their usefulness in providing statistical evidence on this issue. After demonstrating the sensitivity of single-equation models to specification error, we estimate a simultaneous equations model of mortgage credit flows. This model makes it possible to analyze differences in the supply and demand for mortgage credit by the racial composition of the community. We conclude that most, if not all, statistical evidence of racial redlining based on aggregate loan data is at best inconclusive, and more likely, misleading.

A Model for Public-Private Sector Distribution Planning for the U.S. Coal Industry

A multiperiod mixed integer linear programming model is proposed as a guide to the urgent expansion of the production and interregional distribution of American coal. The model, run under various scenarios of resource costs and governmental restrictions, should serve as an indicator of the possible performance of the industry, a guide to effective legislation, and a program for optimal location and timing of mines and conversion and transportation facilities.IC2 Institut

A Guide to M.D.I. Statistics for Planning and Management Model Building

This monograph is intended as a practical guide to business applications of the theory of discrimination information statistics as developed by Kullback (1959) and Charnes and Cooper (1975 et seq.). A guide to modeling and computation methods is presented, with references to published applications and a discussion of their implications for business and planning. These implications are developed by means of detailed examples showing MDI to be a practically workable unifying principle for the analysis of demand and market structure. Some applications in other management areas are also noted.IC2 Institut

I Care Not What Your Past May Be : I Love You Just The Same

https://digitalcommons.library.umaine.edu/mmb-vp/3564/thumbnail.jp

We Met, We Loved, We Parted

https://digitalcommons.library.umaine.edu/mmb-vp/2629/thumbnail.jp

Make Up Your Mind: Carolina

https://digitalcommons.library.umaine.edu/mmb-vp/2905/thumbnail.jp

While The Whole Damm Family Stuck Around

https://digitalcommons.library.umaine.edu/mmb-vp/5015/thumbnail.jp

Effects of Collisions with Rocky Planets on the Properties of Hot Jupiters

Observed Hot Jupiters exhibit a wide range of physical properties. For a given mass, many planets have inflated radii, while others are surprisingly compact and may harbor large central cores. Motivated by the observational sample, this paper considers possible effects from collisions of smaller rocky planets with gas giant planets. In this scenario, the Jovian planets migrate first and enter into (approximately) 4 day orbits, whereas rocky planets (mass = 0.1-20 that of Earth) migrate later and then encounter the gaseous giants. Previous work indicates that the collision rates are high for such systems. This paper calculates the trajectories of incoming rocky planets as they orbit within the gaseous planets and are subjected to gravitational, frictional, and tidal forces. These collisions always increase the metallicity of the Jovian planets. If the incoming rocky bodies survive tidal destruction and reach the central regions, they provide a means of producing large planetary cores. Both the added metallicity and larger cores act to decrease the radii of the gas giants at fixed mass. The energy released during these collisions provides the Jovian planet with an additional heat source; here we determine the radial layers where kinetic energy of the colliding body is dissipated, including the energy remaining upon impact with the existing core. This process could have long-term effects if the colliding body deposits significant energy deep in the interior, in regions of high opacity. Both Hot Jupiters and newly formed gas giants have inflated radii, large enough to allow incoming rocky planets to survive tidal disruption, enhance the central core mass, and deposit significant energy (in contrast, denser giant planets with the mass and radius of Jupiter are expected to tidally destroy incoming rocky bodies).Comment: 35 pages, 11 figures, accepted to PAS