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Data Reduction 3: Data Compression

  • String compression
    • There are extensive theories and well-tuned algorithms
    • Typically lossless, but only limited manipulation is possible without expansion
  • Audio/video compression
    • Typically lossy compression, with progressive refinement
    • Sometimes small fragments of signal can be reconstructed without reconstructing the whole
  • Time sequence is not audio
    • Typically short and vary slowly with time
  • Dimensionality and numerosity reduction may also be considered as forms of data compression

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