نتایج جستجو برای: signal correction

تعداد نتایج: 575709  

2003
PINAR KARACA-MANDIC KENNETH TRAIN

Data at different levels of aggregation are often used in two-stage estimation, with estimates obtained at the higher level of aggregation entering the estimation at the lower level of aggregation. An example is customers within markets: first-stage estimates on market data provide variables that enter the second-stage model on customers. We derive the asymptotic covariance matrix of the second...

Journal: :The Journal of the Acoustical Society of America 1979

Journal: :Magnetic resonance imaging 2007
Ning Xu J Michael Fitzpatrick Yong Li Benoit M Dawant David R Pickens Victoria L Morgan

As an extension of previous work on computer-generated phantoms, more accurate, realistic phantoms are generated by integrating image distortion and signal loss caused by susceptibility variations. With the addition of real motions and activations determined from actual functional MRI studies, these phantoms can be used by the fMRI community to assess with higher fidelity pre-processing algorit...

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