466 research outputs found
High Grading Standards Improve Student Performance
Allgemeinbildende Schule, Schulpolitik, Qualifikation, Vereinigte Staaten, General schooling, School policy, Occupational qualification, United States
Do High Grading Standards Affect Student Performance?
This paper explores the effects of high grading standards on student test performance in elementary school. While high standards have been advocated by policy-makers, business groups, and teacher unions, very little is known about their effects on outcomes. Most of the existing research on standards is theoretical, generally finding that standards have mixed effects on students. However, very little empirical work has to date been completed on this topic. This paper provides the first empirical evidence on the effects of grading standards, measured at the teacher level. Using an exceptionally rich set of data including every third, fourth, and fifth grader in a large school district over four years, we match students' test score gains and disciplinary problems to teacher-level grading standards. In models in which we control for student-level fixed effects, we find substantial evidence that higher grading standards benefit students. We find that these effects are not uniform: High-achieving students apparently benefit most from high standards when in a relatively low-achieving class, and low-achieving students benefit most from high standards when in a relatively high-achieving class.
What's in a Grade? School Report Cards and House Prices
Throughout the last decade, many states around the country have begun making public student test scores or other evaluative measures of school quality available to the general public. The most recent trends in state policies under consideration, already enacted in Florida and a n major component of George W. Bush's education platform, involve the assignment of letter grades to rate school quality. Because school quality is one of a group of local public goods purchased along with a house, one would anticipate that additional information about school quality would capitalize into real estate values. This paper takes the first look at the role that this type of added information plays in the capitalization of school quality measures. We use rich student test score and housing value data from a medium-sized Florida school district, one of the nation's 200 largest, to directly investigate this link. Using data on repeat sales of properties before and after the assignment of school letter grades, we find significant evidence that arbitrary distinctions embedded in school report cards lead to major housing price effects.
Measurement of the cosmic ray spectrum above eV using inclined events detected with the Pierre Auger Observatory
A measurement of the cosmic-ray spectrum for energies exceeding
eV is presented, which is based on the analysis of showers
with zenith angles greater than detected with the Pierre Auger
Observatory between 1 January 2004 and 31 December 2013. The measured spectrum
confirms a flux suppression at the highest energies. Above
eV, the "ankle", the flux can be described by a power law with
index followed by
a smooth suppression region. For the energy () at which the
spectral flux has fallen to one-half of its extrapolated value in the absence
of suppression, we find
eV.Comment: Replaced with published version. Added journal reference and DO
Energy Estimation of Cosmic Rays with the Engineering Radio Array of the Pierre Auger Observatory
The Auger Engineering Radio Array (AERA) is part of the Pierre Auger
Observatory and is used to detect the radio emission of cosmic-ray air showers.
These observations are compared to the data of the surface detector stations of
the Observatory, which provide well-calibrated information on the cosmic-ray
energies and arrival directions. The response of the radio stations in the 30
to 80 MHz regime has been thoroughly calibrated to enable the reconstruction of
the incoming electric field. For the latter, the energy deposit per area is
determined from the radio pulses at each observer position and is interpolated
using a two-dimensional function that takes into account signal asymmetries due
to interference between the geomagnetic and charge-excess emission components.
The spatial integral over the signal distribution gives a direct measurement of
the energy transferred from the primary cosmic ray into radio emission in the
AERA frequency range. We measure 15.8 MeV of radiation energy for a 1 EeV air
shower arriving perpendicularly to the geomagnetic field. This radiation energy
-- corrected for geometrical effects -- is used as a cosmic-ray energy
estimator. Performing an absolute energy calibration against the
surface-detector information, we observe that this radio-energy estimator
scales quadratically with the cosmic-ray energy as expected for coherent
emission. We find an energy resolution of the radio reconstruction of 22% for
the data set and 17% for a high-quality subset containing only events with at
least five radio stations with signal.Comment: Replaced with published version. Added journal reference and DO
Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy
We measure the energy emitted by extensive air showers in the form of radio
emission in the frequency range from 30 to 80 MHz. Exploiting the accurate
energy scale of the Pierre Auger Observatory, we obtain a radiation energy of
15.8 \pm 0.7 (stat) \pm 6.7 (sys) MeV for cosmic rays with an energy of 1 EeV
arriving perpendicularly to a geomagnetic field of 0.24 G, scaling
quadratically with the cosmic-ray energy. A comparison with predictions from
state-of-the-art first-principle calculations shows agreement with our
measurement. The radiation energy provides direct access to the calorimetric
energy in the electromagnetic cascade of extensive air showers. Comparison with
our result thus allows the direct calibration of any cosmic-ray radio detector
against the well-established energy scale of the Pierre Auger Observatory.Comment: Replaced with published version. Added journal reference and DOI.
Supplemental material in the ancillary file
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