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Mainly , changes have been made to streamline the input to reduce user dependence and allow more internal estimation of parameters . ABSTRACT - This paper describes the application of sequential filtering to the estimation of parameters in nonlinear models of components in mechanical vibrating structures . Her prize-winning paper " Forecasting Social Security Actuarial Assumptions " with Frees et al. treats statistical estimation of parameters for a linear model which predicts future social security liabilities of the federal government . Special emphasis is placed on estimation of parameters of economic models and statistical inference using estimated models to determine the validity of economic theories . ABSTRACT : In this proposal , we will present two kinds of stochastic models for high frequency time series data and develop statistical approaches to estimation of parameters in these models .