摘要 :
The Rocky Flats Standards Laboratory has devised a method to utilize a deadweight pressure gage to calibrate proving rings to 1050 pounds of force (lbf). The equipment and the necessary modifications are described, as is the setup...
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The Rocky Flats Standards Laboratory has devised a method to utilize a deadweight pressure gage to calibrate proving rings to 1050 pounds of force (lbf). The equipment and the necessary modifications are described, as is the setup and operation. The modifications are additions to the main structure of the pressure gage allowing direct force measurements without damaging or permanently altering the pressure gage. Also included are a brief description of the computer program used with the system and an error analysis of the system. This development has increased the Standards Laboratory capabilities; previously, proving rings to be calibrated were sent to the National Bureau of Standards or the Primary Standards Laboratory. (ERA citation 10:023046)
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摘要 :
We consider estimation of finite population totals in the presence of nonresponse, assuming nonresponses arise randomly within response classes. We compare two regression estimators: one based on the adjusted for nonresponse proba...
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We consider estimation of finite population totals in the presence of nonresponse, assuming nonresponses arise randomly within response classes. We compare two regression estimators: one based on the adjusted for nonresponse probability weights, the other based on unadjusted weights. We show that when the auxiliary variables used for nonresponse adjustment are included in the estimators, they differ only slightly. In this case, the nonresponse adjustment step can be omitted from the estimation process without loss of generality (from Result 5 of Deville and Sarndal (1992), it follows the same remains correct for a wide class of calibration estimators). We consider a multivariate analog of a 'regression through the origin' estimator and show the 'adjusted' and 'unadjusted' estimators coincide in this case. We also consider calibration estimators under restrictions on weights. We show that if there exists even one set of weights satisfying the calibration equations and restrictions, the benchmark estimator does not depend on the restrictions.
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摘要 :
This document describes the Calibration Program for the Instrumentation and Controls Division's Technical Support Section (TSS). The Calibration Program is a planned, systematic schedule of actions necessary to provide confidence ...
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This document describes the Calibration Program for the Instrumentation and Controls Division's Technical Support Section (TSS). The Calibration Program is a planned, systematic schedule of actions necessary to provide confidence that equipment used to make measurements or quality judgements meets established technical requirements and that its performance is traceable to nationally recognized standards.
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摘要 :
This document describes the Calibration Program for the Instrumentation andControls Division's Technical Support Section (TSS). The Calibration Program is a planned, systematic schedule of actions necessary to provide confidence t...
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This document describes the Calibration Program for the Instrumentation andControls Division's Technical Support Section (TSS). The Calibration Program is a planned, systematic schedule of actions necessary to provide confidence that equipment used to make measurements or quality judgements meets established technical requirements and that its performance is traceable to nationally recognized standards.
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