1,047 research outputs found
The impact of apartment vacancies on nearby housing rents over multiple time periods: application of smart meter data
[Purpose] This study aims to explore the spatial externalities of apartment vacancy rates on housing rent by considering multiple vacancy durations. [Design/methodology/approach] This research uses smart meter data to measure unobservable vacant houses. This study made a significant contribution by applying building-level smart meter data to housing market analysis. It examined whether vacancy duration significantly affected apartment rent and whether the relationship between apartment rent and vacancy rate differed depending on the level of housing rent. [Findings] The primary finding indicates that there is a significant negative correlation between apartment rent and vacancy duration. Considering the spatial externalities of apartment vacancy rates, the apartment vacancy rates of surrounding buildings did not show any statistical significance. Moreover, quantile regression results indicate that although the bottom 10% of apartment rent levels showed a negative correlation with all vacancy durations, the top 10% showed no statistical significance related to vacancies. [Practical implications] This study measures the extent of spatial externalities that can differentiate taxation based on housing vacancies. [Originality/value] The findings indicate that landlords have asymmetric information about their buildings compared with the surrounding buildings, and the extent to which price adjusts for long-term vacancies differs depending on the level of apartment rent
Chi-square approximation for the distribution of individual eigenvalues of a singular Wishart matrix
This paper discusses the approximate distributions of eigenvalues of a
singular Wishart matrix. We give the approximate joint density of eigenvalues
by Laplace approximation for the hyper-geometric functions of matrix arguments.
Furthermore, we show that the distribution of each eigenvalue can be
approximated by the chi-square distribution with varying degrees of freedom
when the population eigenvalues are infinitely dispersed. The derived result is
applied to testing the equality of eigenvalues in two population
Numerical computation for the exact distribution of Roy's largest root statistic under linear alternative
This paper discusses the computation of exact powers for Roy's test in
multivariate analysis of variance~(MANOVA). We derive an exact expression for
the largest eigenvalue of a singular noncentral Beta matrix in terms of the
product of zonal polynomials. The numerical computation for that distribution
is conducted by an algorithm that expands the product of zonal polynomials as a
linear combination of zonal polynomials. Furthermore, we provide an exact
distribution of the largest eigenvalue in a form that is convenient for
numerical calculations under the linear alternative
Ultimate low system dark count rate for superconducting nanowire single-photon detector
The dark count rate (DCR) is a key parameter of single-photon detectors. By
introducing a bulk optical band-pass filter mounted on a fiber-to-fiber optical
bench cooled at 3 K and blocking down to 5 micrometer, we suppressed the DCR of
a superconducting nanowire single-photon detector by more than three orders of
magnitude. The DCR is limited by the blackbody radiation through a signal
passband of 20 nm bandwidth. The figure of merit, system detection efficiency,
and DCR were 2.7 x 10^11, 2.3 %, and 0.001 Hz, respectively. Narrowing the
bandwidth to 100 GHz suppresses the DCR to 0.0001 Hz and the figure of merit
increases to 1.8 x 10^12.Comment: to appear in Optics Letter
CMA-ES with Randomized Dimensional Restriction for High Dimensional and Ill-Conditioned Optimization Problems and Its Application
学位の種別: 修士University of Tokyo(東京大学
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