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Least squares quantization in PCM

It has long been realized that in pulse-code modulation (PCM), with a given ensemble of signals to handle, the quantum values should be spaced more closely in the voltage region...

1982 IEEE Transactions on Information Theory 14858 citations

Principal Component Analysis

Abstract When large multivariate datasets are analyzed, it is often desirable to reduce their dimensionality. Principal component analysis is one technique for doing this. It re...

2005 Encyclopedia of Statistics in Behavio... 14494 citations