scholarly journals Efficiency of Weighted Average Derivative Estimators and Index Models

Econometrica ◽  
1993 ◽  
Vol 61 (5) ◽  
pp. 1199 ◽  
Author(s):  
Whitney K. Newey ◽  
Thomas M. Stoker
Keyword(s):  
Weighted Average ◽  
Average Derivative

scholarly journals Average Derivative Estimation from Biased Data

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Christophe Chesneau ◽  
Maher Kachour ◽  
Fabien Navarro
Keyword(s):  
Rate Of Convergence ◽  
Mean Squared Error ◽  
Weighted Average ◽  
Derivative Estimation ◽  
Squared Error ◽  
The Mean ◽  
Average Derivative Estimation ◽  
Average Derivative

We investigate the estimation of the density-weighted average derivative from biased data. An estimator integrating a plug-in approach and wavelet projections is constructed. We prove that it attains the parametric rate of convergence 1/n under the mean squared error.

scholarly journals SMALL BANDWIDTH ASYMPTOTICS FOR DENSITY-WEIGHTED AVERAGE DERIVATIVES

2013 ◽  
Vol 30 (1) ◽  
pp. 176-200 ◽  
Author(s):  
Matias D. Cattaneo ◽  
Richard K. Crump ◽  
Michael Jansson
Keyword(s):  
Weighted Average ◽  
Standard Errors ◽  
Monte Carlo Experiment ◽  
Finite Sample ◽  
Small Bandwidth ◽  
Nominal Coverage ◽  
Error Formulas ◽  
Coverage Rates ◽  
Asymptotic Validity ◽  
Average Derivative

This paper proposes (apparently) novel standard error formulas for the density-weighted average derivative estimator of Powell, Stock, and Stoker (Econometrica 57, 1989). Asymptotic validity of the standard errors developed in this paper does not require the use of higher-order kernels, and the standard errors are “robust” in the sense that they accommodate (but do not require) bandwidths that are smaller than those for which conventional standard errors are valid. Moreover, the results of a Monte Carlo experiment suggest that the finite sample coverage rates of confidence intervals constructed using the standard errors developed in this papercoincide (approximately) with the nominal coverage rates across a nontrivial range of bandwidths.

scholarly journals AVERAGE DERIVATIVE ESTIMATION UNDER MEASUREMENT ERROR

2020 ◽  
pp. 1-30 ◽  
Author(s):  
Hao Dong ◽  
Taisuke Otsu ◽  
Luke Taylor
Keyword(s):  
Measurement Error ◽  
Asymptotic Variance ◽  
Asymptotic Properties ◽  
Weighted Average ◽  
Error Characteristic ◽  
Finite Sample ◽  
Gaussian Density ◽  
Error Distributions ◽  
Error Density ◽  
Average Derivative

Abstract In this paper, we derive the asymptotic properties of the density-weighted average derivative estimator when a regressor is contaminated with classical measurement error and the density of this error must be estimated. Average derivatives of conditional mean functions are used extensively in economics and statistics, most notably in semiparametric index models. As well as ordinary smooth measurement error, we provide results for supersmooth error distributions. This is a particularly important class of error distribution as it includes the Gaussian density. We show that under either type of measurement error, despite using nonparametric deconvolution techniques and an estimated error characteristic function, we are able to achieve a $\sqrt {n}$ -rate of convergence for the average derivative estimator. Interestingly, if the measurement error density is symmetric, the asymptotic variance of the average derivative estimator is the same irrespective of whether the error density is estimated or not. The promising finite sample performance of the estimator is shown through a Monte Carlo simulation.

Summer phytoplankton of the northern Barents Sea (75–80º N)

2019 ◽  
pp. 8-19
Author(s):  
Larisa A. Pautova ◽  
Vladimir A. Silkin ◽  
Marina D. Kravchishina ◽  
Valeriy G. Yakubenko ◽  
Anna L. Chultsova
Keyword(s):  
Barents Sea ◽  
Weighted Average ◽  
Arctic Basin ◽  
High Arctic ◽  
Alexandrium Tamarense ◽  
Warm Water ◽  
The Arctic ◽  
Absolute Maximum ◽  
Deep Trench ◽  
Maximum Biomass

The structure of the summer planktonic communities of the Northern part of the Barents sea in the first half of August 2017 were studied. In the sea-ice melting area, the average phytoplankton biomass producing upper 50-meter layer of water reached values levels of eutrophic waters (up to 2.1 g/m3). Phytoplankton was presented by diatoms of the genera Thalassiosira and Eucampia. Maximum biomass recorded at depths of 22–52 m, the absolute maximum biomass community (5,0 g/m3) marked on the horizon of 45 m (station 5558), located at the outlet of the deep trench Franz Victoria near the West coast of the archipelago Franz Josef Land. In ice-free waters, phytoplankton abundance was low, and the weighted average biomass (8.0 mg/m3 – 123.1 mg/m3) corresponded to oligotrophic waters and lower mesotrophic waters. In the upper layers of the water population abundance was dominated by small flagellates and picoplankton from, biomass – Arctic dinoflagellates (Gymnodinium spp.) and cold Atlantic complexes (Gyrodinium lachryma, Alexandrium tamarense, Dinophysis norvegica). The proportion of Atlantic species in phytoplankton reached 75%. The representatives of warm-water Atlantic complex (Emiliania huxleyi, Rhizosolenia hebetata f. semispina, Ceratium horridum) were recorded up to 80º N, as indicators of the penetration of warm Atlantic waters into the Arctic basin. The presence of oceanic Atlantic species as warm-water and cold systems in the high Arctic indicates the strengthening of processes of “atlantificacion” in the region.

The quantitative and qualitative contributions of faith based organizations to healthcare: The Kenya case

2017 ◽  
Vol 4 (3) ◽  
pp. 60-71 ◽  
Author(s):  
Alfredo Fort
Keyword(s):  
Health Facility ◽  
Management Practices ◽  
Developing World ◽  
Weighted Average ◽  
Relative Strength ◽  
For Profit ◽  
Faith Based ◽  
Non Governmental Organizations ◽  
Faith Based Organizations ◽  
The Government

Though difficult to ascertain because faith based organizations (FBOs) might keep a low profile, be confused with other non-governmental organizations (NGOs), or survey respondents may not know the nature of facilities attended to, these organizations have a long presence in teaching health personnel and delivering health services in many rural and remote populations in the developing world. It is argued that their large networks, logistics agreements with governments, and mission-driven stance brings them closer to the communities they serve, and their services believed of higher quality than average. Kenya has a long history of established FBOs substantial recent health investment by the government. We aimed to find the quantitative and qualitative contributions of FBOs by analyzing two recent data sources: the live web-based nationwide Master Health Facility List, and the 2010 nationwide Service Provision Assessment (SPA) survey. Using this information, we found that FBOs contribute to 11% of all health facilities’ presence in the country, doubling to 23% of all available beds, indicating their relative strength in owning mid-level hospitals around the country. We also constructed an index of readiness as a weighted average from services offered, good management practices and availability of medicines and commodities for 17 items assessed during the SPA survey. We found that FBOs topped the list of managing authorities, with 70 percent of health facility readiness, followed closely by the government at 69 percent, NGOs at 61 percent and lastly a distant private for profit sector at 50 percent. These results seem to indicate that FBOs continue to contribute to an important proportion of health care coverage in Kenya, and that they do so with a relatively high quality of care among all actors. It would be of interest to replicate the analysis with similar databases for other countries in the developing world.

Catch them Young : Role of Educational Institutions in Community Development- A Descriptive Study on the Perception of College Students in Chennai

GIS Business ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. 170-182
Author(s):  
Dr. R. Sundari ◽  
Ms. Sangeetha Manoj
Keyword(s):  
Community Development ◽  
Collective Action ◽  
Body Politic ◽  
Weighted Average ◽  
Well Being ◽  
Educational Institutions ◽  
Average Score ◽  
Academic Institutions ◽  
Grass Root Level

Community Development is a process of collective action taken by the members of a community to generate solutions for common problems.  The aspects of community well being namely Economic, Social, Environmental and Cultural well being evolves from this type of collective action taken at multiple societal levels. (Weaver, 1971) defines community development as a process of “A public-group approach dedicated to achieving the goals of the total body politic.” Therefore, it is evident that a community can be developed through the effective participation of citizens. It is universally acceptable that community service is a vehicle for safeguarding the environment that is initiated from the participants of the community. In order to imbibe the community consciousness among the citizens, every country should “Catch them Young”. The purpose of the paper is to integrate Participative Model (Active Citizenship, Citizen Networks and Co-production) with Self-service Model (Social Governance, Societal Discipline and Accountability). National and international reviews show that the perception about the community and realisation has to be ingrained at the grass root level; this can be achieved through the participation of academic institutions. This paper is an attempt to highlight. The initiatives taken by educational institutions to imbibe social consciousness, The perceptions of students about their role in community development, and, To identify the effective Private Public Partnership areas for community building Factor analysis has been applied to identify the role of educational institutions and individual citizen’s( Students) in building community consciousness. Linear Regression had been applied in the study to measure the influence of Educational Institutions on the role of Students in building the community.  A weighted average score is awarded by the students for the potential areas of public private partnership for community development is highlighted. The results of the study provide an impact created by the institution over the students. The Study also, consolidates some of the successful community bonding and building activities carried out Academic Institutions.

APPLICATION OF THE INTENSIVE CROP GROWING TECHNOLOGIES IN CROP ROTATION IS THE STABILITY CONDITION OF THE HUMUS CONTENT OF SOIL

1970 ◽  
pp. 52-56
Author(s):  
V. А. Shchedrin
Keyword(s):  
Soil Fertility ◽  
Crop Rotation ◽  
Humus Content ◽  
Arable Land ◽  
Weighted Average ◽  
Cropping System ◽  
Investment Project ◽  
Crop Rotations ◽  
High Productivity ◽  
Labile Phosphorus

In OOO “Dubovitskoe” which was organized in 2006 as investment project of the AO “Shchelkovo Agrokhim” for 2010 – 2012 three advanced crop rotations have been developed. Before their introduction the grain crops fraction in the cropping system was 62%, then it fell to 49%. At the same time the portion of raw crops increased from 15 to 20%, legumes from 6 to 8%, others (buckwheat, grain maize, etc.) - up to 23%. As of 2017, the crops of leguminous crops have increased noteworthily. There are two predominant soil types here heavy clay loam podzolized chernozem (6615 ha) and grey forest soil (856 ha). Weighted average indicators (as of 2017): humus content in the soils of arable land is 5, 34%; acidity pH is 4.92; labile phosphorus - 111.8 mg / kg soil; exchange potassium - 144 mg / kg soil. The coefficient of the soil fertility in the enterprise (weighted average) is 0.66. This means that maintaining and increasing the soil fertility for arable land of the enterprise is critical task. As a result of the research, it has been established that the technologies introduced in the crop vegetation management (CVS) in the crop rotation conditions ensure high productivity of cultivated crops and stability of humus content in soils as an energy basis and a guarantor of increasing fertility. The indicators of the labile phosphorus Р205 and exchange potassium К20 in the soils depending on the crop rotation vary from a certain decrease to expressed steady growth. Therefore it is necessary to specify seeding rates based on actual data. Sustainable soil acidification in the crop rotations under crop cultivation in OOO “Dubovitskoe” it is the result of the acid feterlizers high rates application, during studying period did not carried out required agromelioration with calcium contenting elements.

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