Moment (mathematics) | Econometric modeling
In statistics and econometrics, optimal instruments are a technique for improving the efficiency of estimators in conditional moment models, a class of semiparametric models that generate conditional expectation functions. To estimate parameters of a conditional moment model, the statistician can derive an expectation function (defining "moment conditions") and use the generalized method of moments (GMM). However, there are infinitely many moment conditions that can be generated from a single model; optimal instruments provide the most efficient moment conditions. As an example, consider the nonlinear regression model where y is a scalar (one-dimensional) random variable, x is a random vector with dimension k, and θ is a k-dimensional parameter. The conditional moment restriction is consistent with infinitely many moment conditions. For example: More generally, for any vector-valued function z of x, it will be the case that . That is, z defines a finite set of orthogonality conditions. A natural question to ask, then, is whether an asymptotically efficient set of conditions is available, in the sense that no other set of conditions achieves lower asymptotic variance. Both econometricians and statisticians have extensively studied this subject. The answer to this question is generally that this finite set exists and have been proven for a wide range of estimators. Takeshi Amemiya was one of the first to work on this problem and show the optimal number of instruments for nonlinear simultaneous equation models with homoskedastic and serially uncorrelated errors. The form of the optimal instruments was characterized by Lars Peter Hansen, and results for nonparametric estimation of optimal instruments are provided by Newey. A result for nearest neighbor estimators was provided by Robinson. (Wikipedia).
Multimeter Review / DMM Review / buyers guide / tutorial
A list of my multimeters can be purchased here: http://astore.amazon.com/m0711-20?_encoding=UTF8&node=5 In this video I do a review of several digital multimeters. I compare features and functionality. I explain safety features, number of digits, display count, accuracy and resolution. Th
From playlist Multimeter reviews, buyers guide and comparisons.
Electronic measurement equipment and multimeters - Part 1
In this video series I show different measurement equipment (multimeters, etc) and why / how I use them. In later videos I'll explore different features and highlight pro's and con's. A list of my multimeters can be purchased here: http://astore.amazon.com/m0711-20?_encoding=UTF8&node=
From playlist Electronic Measurement Equipment
Vernier caliper / diameter and length of daily used objects.
subscribe to my channel: https://www.youtube.com/channel/UC7HtImwPgmb1axsTJE5lxeA?sub_confirmation=1
From playlist Fine Measurements
Universe of Instrumentation Series
This series highlights the most important instruments used by engineers and consumers today. From space to our pockets our life is dependent on sensors. Understanding the basics of each type helps us construct an real view of our society and universe. Learn about the inventors, uses and cl
From playlist Universe of Instrumentation Series
From playlist filter (less comfortable)
Physics 59 Optical Instruments (2 of 20) The Telescope
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 In this video I will have a discussion on the how the telescope works and show you how to find its magnification. Previous video in
From playlist PHYSICS - OPTICS
This is yet another useful tool for engineers, described by J. Lowe from NIST. Engineers can compare the accuracy of clocks and troubleshoot instruments using the time frequency counter. This video is appendix II.B.v3 and is part of the Universe of Instrumentation Program.
From playlist Universe of Instrumentation Series
Micrometer/diameter of daily used objects.
What was the diameter? music: https://www.bensound.com/
From playlist Fine Measurements
EmberConf 2017: MiniTalk: Instrumenting Ember Apps with Heimdall by Chris Thoburn
MiniTalk: Instrumenting Ember Apps with Heimdall by Chris Thoburn
From playlist EmberConf 2017
Rama Vasudevan - Advancing Microscopy with Machine Learning: Lessons from Scanning Probe Microscopy
Recorded 29 November 2022. Rama Vasudevan of Oak Ridge National Laboratory presents "Advancing Microscopy with Machine Learning: Lessons and Insights from Scanning Probe Microscopy" at IPAM's Multi-Modal Imaging with Deep Learning and Modeling Workshop. Abstract: Scanning probe microscopy
From playlist 2022 Multi-Modal Imaging with Deep Learning and Modeling
Velocity 2010: Tony Ralph, "Display Ads and Page Performance: A Brief Tour of the Ad Ecosystem"
Tony Ralph (Yahoo! Inc.), "Display Ads and Page Performance: A Brief Tour of the Ad Ecosystem"
From playlist Velocity 2010
AI Safety - Reading Group 3 - Bostrom "The superintelligent will"
The full details of the paper: Nick Bostrom, 2012, “The superintelligent will: Motivation and instrumental rationality in advanced artificial agents”, Minds and Machines. We discuss how this relates to Omohundro's paper on AI drives, and some of the new perspectives offered by the emergenc
From playlist AI Safety seminar
Materialism Podcast Ep 55: Ceramics in Real Time
Anyone who has worked with ceramics knows that they are notoriously difficult to work with and gain data on. We sit down with Daniele Paganelli to discuss their current measurement devices and how they work. We also look to the future as Daniele explains their plans for a new online cerami
From playlist Materialism Podcast
3D Printing a Glockenspiel | Two Minute Papers #17
Researchers at Harvard, Columbia University and MIT got interested in exploring the sounds that different metal objects emit when struck, opening up the possibility of computationally designing musical instruments such as a glockenspiel. The output of the algorithm is the blueprint of the
From playlist Two Minute Papers
Unit 7 - government policy part 1
From playlist Courses and Series
RailsConf 2015 - A New Kind of Analytics: Actionable Performance Analysis
By, Paola Moretto Applications today are spidery and include thousands of possible optimization points. No matter how deep performance testing data are, developers are still at a loss when asked to derive meaningful and actionable data that pinpoint to bottlenecks in the application. You k
From playlist RailsConf 2015
Computing z-scores(standard scores) and comparing them
Please Subscribe here, thank you!!! https://goo.gl/JQ8Nys Computing z-scores(standard scores) and comparing them
From playlist Statistics
RailsConf 2015 - A New Kind of Analytics: Actionable Performance Analysis
by Paola Moretto Applications today are spidery and include thousands of possible optimization points. No matter how deep performance testing data are, developers are still at a loss when asked to derive meaningful and actionable data that pinpoint to bottlenecks in the application. You k
From playlist RailsConf 2015