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2009 JUN 8 ... leave residual confounding because of unmeasured factors. Propensity scores (PS) and instrumentalvariable (IV) methods have become increasingly popular with the intent to address ... (BUSM) and Boston University School of Public Health have found that no adjustment method fully resolves confounding by indication in observational studies, meaning when the ...
2009 JUN 29 ... treatment efficacy in this situation: as-treated analysis, per-protocol analysis, and instrumentalvariable (IV) estimation, where the treatment effect is estimated using the ... as an IV," researchers in the United States report.
"Both model- and method-of-moment based IV estimators are considered. The assumptions underlying these ...
2009 FEB 23 ... A report, 'Instrumentalvariable analysis for estimation of treatment effects with dichotomous outcomes,' is ... include probit structural equation models, 2-stage logistic models, and generalized method of moments estimators. Employing these methods, in the first study the authors observed ...
2009 NOV 16 ... of 170,024 Kaiser Permanente members with diabetes, CAD, or both." "Using instrumentalvariable analysis, we assessed the impact of promoting the cardioprotective bundle on ... colleagues, Kaiser Permanente. The researchers concluded: "A simplified method for bundling fixed doses of a generic statin and an ACEI/ARB was successfully ...
2009 MAR 23 ... assumptions and provides substantial finite-sample efficiency gains over the standard instrumentalvariable estimator. Our estimator is asymptotically equivalent to the standard ... University of Florida.
The researchers concluded: "We apply our method to data from a randomized trial of an intervention to improve the treatment of ...
2009 JUL 13 ... component of videofluoroscopic swallowing evaluation, the most commonly utilized instrumentalmethod for dysphagia diagnosis and treatment. Currently published literature indicates ... for all interventions by SLPs for identification of aspiration (all kappa > 0.86) and variable accuracy (range = 69-76%) using the Penetration/Aspiration Scale when compared to expert ...
2008 JUL 7 ... identified during follow-up, through December 2003. The analysis was conducted with an instrumental variable method and a bivariate probit model, controlling for individual, social, and health care system ...
2008 AUG 11 ... of in-hospital mortality. In grouped-treatment (GT) analyses, a method based on the instrumentalvariable approach that bypasses selection bias, the hospital rate of stroke admission to ...
2008 DEC 1 ... Neurotherapeutics at University of Washington, Seattle, and his research team have been instrumental in establishing a new paradigm for HD neurodegeneration by linking nuclear transcription ... about half of all patients are diagnosed before 18 years of age. These patients have variable combinations of problems with anemia, low platelet counts (causing risk of bleeding), ... have recently completed which extends this genome-wide association scan (GWAS) method to investigate the genetic aspects of drug response (pharmacogenetics) related to ...
2007 SEP 11 ... the "Green River Serial Killer," Gary Ridgway. The results from the MiniFiler kit were instrumental in confirming the identification of Ms. Bachmann, bringing closure to this long-standing ... allow analysis of very small fragments of DNA. STRs are repeated DNA sequences that are variable in length and are widespread throughout the human genome. Such variability allows ... is to increase the automation of the analytical process and create a more intuitive method for managing the screening of compounds. At the same time, the approach emphasizes the ...
2008 JUL 29 ... concluded: "Based on this assessment, a VFA-IR spectrometer provides an economical instrumental means for at-line monitoring of FFA levels in crude and refined edible oils and ... "The feasibility of employing a portable variable filter array (VFA) IR spectrometer equipped with a transmission flow cell to ... The approach to FFA determination employed was based on a previously reported FTIR method that involves the extraction of FFAs into methanol containing the base NaHNCN, which ...
2008 MAR 18 ... in comprehensive two-dimensional gas chromatography,' have been published. "A new instrumental approach for collection of retention index data in the first (1D) and second (2D) ... mixture could be derived. Comparison of results with indexes determined in temperature-variable one-dimensional (1D) GC showed good correlation. Plotting of the separation power in the ... Royal Melbourne Institute of Technology.
The researchers concluded: "The method will allow straightforward determination of temperature-variable retention indexes of ...
2008 MAR 10 ... detection at variable wavelength for the various analytes in the range 190-240 nm. Instrumental detection limits and operative detection limits in the real matrices were determined ... 97%," wrote G. Favaro and colleagues, .
The researchers concluded: "The method was used for routine analysis of real leather samples."
Favaro and ...
2008 APR 28 ... the United Kingdom report.
"In other observational sciences, the use of instrumentalvariable (IV) approaches has been one approach to strengthening causal inferences in ... of IV analysis that can be implemented within observational epidemiological studies. The method has been referred to as 'Mendelian randomization', and can be considered as analogous ...
2007 NOV 20 ... responsive to district partisan conditions and national partisan tides. By applying an instrumental-variablemethod to control for selection bias, we found that challenger experience only ...
2008 JUL 29 ... model. The identification algorithm is based on the least-squares estimation and the instrumental variables method," wrote C.K. Qi and colleagues, City University of Hong Kong.
... Republic of China report.
"The input is a finite-dimensional temporal variable, whereas the spatio-temporal output of the system is measured at a finite number of ...
