Multidimensional isotonic regression and estimation of the threshold value

No abstract available

On the Total Amount of Neutral Hydrogen in the Upper Atmosphere of the Earth

Total neutral hydrogen in earths upper atmospher

Observations of Scattered L Alpha Emission in the Vicinity of the Earth and in the Interplanetary Medium

Ultraviolet photometer measurements in earth vicinity, and in interplanetary medium onboard interplanetary space prob

Extension of CART using multiple splits under order restrictions

CART was introduced by Breiman et al. (1984) as a classification tool. It divides the whole sample recursively in two subpopulations by finding the best possible split with respect to a optimisation criterion. This method, restricted up to date to binary splits, is extended in this paper for allowing also multiple splits. The main problem with this extension is related to the optimal number of splits and the location of the corresponding cutpoints. In order to reduce the computational effort and enhance parsimony, the reduced isotonic regression was used in order to solve this problem. The extended CART method was tested in a simulation study and was compared with the classical approach in an epidemiological study. In both studies the extended CART turned out to be a useful and reliable alternative

Observations and Interpretation of Ultraviolet Emission from the Galaxy

Satellite measurements on ultraviolet emission from galax

Extra-atmospheric Measurements of the Ultraviolet and X-ray Backgrounds and Their Role in the Study of Intergalactic Gas

Ultraviolet and X ray background extraatmospheric measurements and role in study of intergalactic ga

Are Log Markets Competitive? Empirical Evidence and Implications for Canada-U.S. Trade in Softwood Lumber

Under the U.S. Department of Commerce’s ‘changed circumstances’ review, it is possible that the countervail duty on Canadian lumber can be lowered if administered stumpage prices are based on transaction evidence appraisal – on actual auction data and regression analysis. The Province of British Columbia is implementing such a market-based approach to set stumpage fees, relying on timber auction data from the Small Business Forest Enterprise Program (SBFEP) and OLS regression. We employ SBFEP data to estimate a truncated regression model, comparing our estimates of stumpage fees with the OLS results. It turns out that the OLS approach is biased and likely results in overestimates of stumpage in some timber stands and underestimates in others. Further, we demonstrate that number of bidders has an important impact on bids, but that this could create even more problems for resolving the trade dispute.Canada-U.S. softwood lumber trade, truncated regression, timber auctions, public ownership of forestland

Dust-Gas Interaction in SNR 1987A

Multiwavelength observations of SNR 1987A show that its morphology is rapidly changing at X-ray, radio, and optical wavelengths as the blast wave from the explosion expands into the circumstellar equatorial ring. Infrared emission arises from the interaction of dust grains with the hot X-ray emitting gas. We show that the IR emission provides important complementary information on the interaction of the SN blast wave with the circumstellar equatorial ring that cannot be obtained at any other wavelength.Comment: 8 pages, 4 figures; review talk to appear in the AIP Proceedings of the Conference " Supernova 1987A: 20 Years after - Supernovae and Gamma-Ray Bursters" held in Aspen Co USA, Feb 19-23, 200

A wave-function Monte Carlo method for simulating conditional master equations

Wave-function Monte Carlo methods are an important tool for simulating quantum systems, but the standard method cannot be used to simulate decoherence in continuously measured systems. Here we present a new Monte Carlo method for such systems. This was used to perform the simulations of a continuously measured nano-resonator in [Phys. Rev. Lett. 102, 057208 (2009)].Comment: 4 pages, revtex 4, 1 eps figure. v2: correction to Eqs (3),(9), and (11); v3 added further informatio

SAY HAY AND HAY WEST: CHARITY, GOVERNMENT AND FARMER RESPONSES TO THE 2002 DROUGHT IN WESTERN CANADA

Crop Production/Industries,