[Rasch] Mean diferences and measurement error
Mike Linacre (RMT)
rmt at rasch.org
Sun Jun 3 20:12:47 EST 2007
You wrote: I mean something like sqrt(sampling error^2 + measurement
error^2) and so assess better mean groups differences?
Generally speaking, you are correct. Combining measures which have
measurement errors is the same as combining the means and standard
deviations of pooled samples of (supposedly) error-free measures. If the
measurement errors differ across the measurements, you may also want to
weight the measures when computing their means.
Editor, Rasch Measurement Transactions
rmt at rasch.org www.rasch.org/rmt/ Latest RMT: 20:4 Spring 2007
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