نتایج جستجو برای: 2sls re

تعداد نتایج: 175836  

ژورنال: :پژوهش های آسیب شناسی زیستی 0
roghaye norouzi m.sc. student, department of medical parasitology, school of medical sciences, tarbiat modares university, tehran, iran abdolhossein dalimi professor, department of medical parasitology, school of medical sciences, tarbiat modares university, tehran, iran mehdi forouzandeh associated professor, department of medial biotechnology, school of medical sciences, tarbiat modares university, tehran, iran fatemeh ghaffarifar associated professor, department of medical parasitology, school of medical sciences, tarbiat modares university, tehran, iran

هدف: توکسوپلاسما ممکن است ایجاد آسیب در جنین و از انگل های فرصت طلب در بیماران با ایمنی سرکوب شده است. استفاده از روش های مولکولی برای تشخیص بیماری حساس تر از روش های سرولوژیک است. استفاده از روش pcr-elisa حساسیت و ویژگی بالا، زمان تشخیص توکسوپلاسموزیس نیز سریع تر است. در این پژوهش از روش pcr-elisa با استفاده از قطعه dna re، برای تشخیص توکسوپلاسموزیس به کار رفت. از مزایای این روش حساسیت و اختصا...

2006
Markus Frölich Samuel Berlinski Michael Lechner Patrick Puhani Barbara Sianesi

A Note on Parametric and Nonparametric Regression in the Presence of Endogenous Control Variables This note argues that nonparametric regression not only relaxes functional form assumptions vis-a-vis parametric regression, but that it also permits endogenous control variables. To control for selection bias or to make an exclusion restriction in instrumental variables regression valid, additiona...

2015
Isaiah Andrews Timothy B. Armstrong

We derive mean-unbiased estimators for the structural parameter in instrumental variables models where the sign of one or more first stage coefficients is known. In the case with a single instrument, the unbiased estimator is unique. For cases with multiple instruments we propose a class of unbiased estimators and show that an estimator within this class is efficient when the instruments are st...

2009
Richard J. Cebula Kyle Taylor

This study addresses a question that has not been researched much previously, namely, does the unavailability of health insurance act as an incentive for persons to enlist in the military in the U.S.? This relationship is proffered as the “Military Health Care Magnet Hypothesis.” The present study endeavors to provide insight into this issue within a cost-benefit framework. The empirical analys...

2012
Badi H. Baltagi Ying Deng

This paper derives a 3SLS estimator for a simultaneous system of spatial autoregressive equations with random effects which can therefore handle endoegeneity, spatial lag dependence, heterogeneity as well as cross equation correlation. This is done by utilizing the Kelejian and Prucha (1998) and Lee (2003) type instruments from the cross-section spatial autoregressive literature and marrying th...

2008
Chia-Lin Chang

The paper analyses the impact of geographic innovation on Total Factor Productivity (TFP) in Taiwan. Using 242 four-digit standard industrial classification (SIC) industries in Taiwan in 2001, we compute TFP by estimating Translog production functions with K, L, E and M inputs, and measure the geographic innovative activity using both Krugman's Gini coefficients and the location Herfindahl inde...

2015
Subin Im Mahmood Hussain Sanjit Sengupta

Despite the plethora of research on market orientation, our understanding of how different dimensions of market orientation interact with each other in generating new intelligence for marketing programs is limited. In this paper, we develop and test a model that examines the interaction effects of the three dimensions of market orientation—customer orientation, competitor orientation, and cross...

2011
Enrique Pinzón

This paper proposes a new two stage least squares (2SLS) estimator which is consistent and asymptotically normal in the presence of many weak instruments and heteroskedasticity. The first stage of the estimator consists of two components: first, an adaptive absolute shrinkage and selection operator (LASSO) that selects the instruments; and second, an OLS regression with the selected regressors....

2012
D Vincent Fromentin

This paper examines whether or not immigration has a positive influence on the duration of unemployment, in a macroeconomic perspective. We analyse also whether the degree of labor market integration can influence migration. The integration of immigrants into the labor market is a recurrence theme in the work on the economic consequences of immigration. However, to our knowledge, no researchers...

Journal: :Frontiers in business, economics and management 2022

Listed companies are the pillar strength of China’s economy, whose CSR performance is great significance. From perspective sustainable development enterprises, this paper finds that managerial myopia will inhibit enterprises from fulfilling their social responsibilities. Using employment opportunity indicator as an instrumental variable, result 2SLS regression remains significantly negative. In...

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