**AAS 199th meeting, Washington, DC, January 2002**

*Session 100. Galaxy Clusters and Mergers*

Display, Wednesday, January 9, 2002, 9:20am-6:30pm, Exhibit Hall
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## [100.08] Optimal Moments for the Analysis of Peculiar Velocity Surveys

*R. Watkins (Willamette U.), H.A. Feldman (U. Kansas)*

We present a new method for the analysis of peculiar
velocity surveys which removes contributions to velocities
from small scale, nonlinear velocity modes while retaining
information about large scale motions. Our method utilizes
Karhunen-Loeve methods of data compression to construct a
set of moments out of the velocities which are minimally
sensitive to small scale power. The set of moments are then
used in a likelihood analysis. We develop criteria for the
selection of moments, as well as a statistic to quantify the
overall sensitivity of a set of moments to small scale
power. Although we discuss our method in the context of
peculiar velocity surveys, it may also prove useful in other
situations where data filtering is required.

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