Results from PSCz survey

Without data compression

With data compression

Tadros et al 1999

Taylor et al. 2000

?

Power spectrum ?

? = 0.4 ? 0.12

? = 0.56 ? 0.26

Simultaneous measurement of the redshift distortion parameter, ?, and the real-space power spectrum amplitude, showing how data compression improves signal-to-noise.

Spherical Harmonic analysis (4600 modes) + optimised data compression (? 2300 modes), with 1% loss of information Hierarchical data compression, parameter eigenvector methods (Ballinger, Taylor, Heavens & Tadros 2000)

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