Gyroscopic survey technology is one of the key technologies to promote progress directional drilling technology. It great practical significance study error well trajectory measurement based on gyro surveys and identify main sources. This paper introduces sources which lead uncertainty borehole position in gyroscopic survey, six models, calculation model contribution rate ellipse. The differenc...

Abstract Measurement uncertainty, as established in the Guide to Expression of Uncertainty (GUM), is a central concept metrology. The GUM known for its detailed discussions on concepts true value and error their relation measurement uncertainty. However, statements have been source conceptual controversies, sometimes leading inconsistent or unclear descriptions value, error, Here, we discuss th...

For the nonparametric regression models with covariates contaminated normal measurement errors, this paper proposes an extrapolation algorithm to estimate functions. By applying conditional expectation directly kernel-weighted least squares of deviations between local linear approximation and observed responses, proposed successfully bypasses simulation step in classical extrapolation, thus sig...