Member of the Research Staff was asked...April 28, 2017

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I think we need to use Generalized Method of Moments to get the estimates. Since E[e|x] = 0, we have E[h(x)e] = 0 by the law of iterated expectation for any give function h(x). Now we need to find a best function h*(x) such that it will give you efficient GMM estimator. Less

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Actually, you will get least squares estimate as the best estimator in the following sense: y = ax+b+e E(e|x)=0 For any h(x), E(h(x)*e) = E(E(h(x)*e)|x) (where the outer expectation is over X E(h(x)*e|x) = h(x)*E(e|x) = 0 Therefore E(h(x)*e)=0 Take h(x) = y-a-b*x The moment condition is: E(e*(y-a-b*x))=0 This would lead to Least Squares. Less

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I believe the true model was y = ax + b + sigma*(x^2). You can use least squares to define the likelihood or use an L1 penalty. Less

Research Staff Member was asked...October 13, 2016

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I was prepared to talk about these things and had no trouble.

Staff Research Associate I was asked...March 11, 2014

Staff Research Associate I was asked...December 5, 2012

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If the driver is outside the vehicle, his/her initial reaction would run after it. If the driver is in the driver's seat, his/her initial reaction would be "slam on foot padle[s]" (hopefully the brakes) and grab the steering wheel. Excluding involuntary/limbic/fight or flight'reactions. Hmm, today's systems I shall first assume refers to the vehicle. In that case, A steering sensor which cuts power to the engine if the wheel has close to zero resistance relative to its torque baseline as the vehicle accelerates. That same system can be applied to engage the brakes. If we are talking about systems in general, the dealership can simply inform/emphasize to the buyer that the vehicle doesn't use keys... Less

Research Staff Member was asked...January 5, 2013

Research Staff Member was asked...December 24, 2015

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How will you handle skewed datasets?

Staff Security Researcher was asked...April 24, 2020

Staff Researcher was asked...May 17, 2022

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Fairly