[Rasch] Noise in observations ...
Mike Linacre (RMT)
rmt at rasch.org
Sun Nov 4 17:56:16 EST 2007
Paul remarks: "... can only be measured if their observations contain
sufficient noise ..."
Of course, as scientists, we endeavor to reduce irrelevant noise in the
observations in the same way as nuclear physicists do in their experiments
in Quantum Mechanics. But we don't trust only one observation, or
observations that are too close in agreement (recognized as the
"attenuation paradox" in classical test theory or "wood-shedding" in the
We are in the same position as historians:
"When considering an accumulation of evidence, the more randomness in minor
details, the stronger the sense of historical truth."
Gerd Theissen, University of Heidelberg, 1994 (lecture given at the Luther
School of Theology, Chicago).
We are looking for locally-independent sources of information about our
latent variable, in the same way that historians look for
locally-independent accounts of historical events.
Editor, Rasch Measurement Transactions
rmt at rasch.org www.rasch.org/rmt/ Latest RMT: 21:1 Summer 2007
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