JSM 2004 - Toronto

Abstract #301826

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Activity Number: 407
Type: Contributed
Date/Time: Thursday, August 12, 2004 : 8:30 AM to 10:20 AM
Sponsor: General Methodology
Abstract - #301826
Title: Optimal Time Spacing for Designing Panel Studies
Author(s): Chen-Pin Wang*+
Companies: University of Texas, San Antonio
Address: Health Science Center, 11700 Wall St. #5303, San Antonio, TX, 78230,
Keywords: design ; time-spacing ; panel study ; changepoint ; missing at random ; latent growth
Abstract:

This paper presents optimal time spacing schemes for designing panel studies. These optimization schemes are sought to maximize statistical power and estimation efficiency under resource constraints. Various latent variable growth models arising from health science research are considered. The parameters of interest are the effects associated with growth factors (e.g., slope and changepoints). Under missing-at-random assumption, we show that the optimization rule can be characterized as a function of (a) Euclidean distance between changepoints and the center of the rest time points selected, (b) the "generalized" variance of the time points other than changepoints, and (c) the "generalized" coefficient of variation associated with the time points other than changepoints.

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