Vol: 41 Page: 27

Authors:
Andrzej Bochniak
Mirosława Wesołowska-Janczarek

Title:
 Valuation of influence of concomitant variables on estimation of polynomial growth curves

Language: English

Keywords:
growth curve methods
concomitant variables
linear mathematical models
parameter estimation methods
computer simulation

Summary:
Frequently in practice the estimation of polynomials which describe course of changes for a studied feature in a given time interval can be significantly disturbed by some concomitant variables with values changing in time. The situation where values of concomitant variables in successive time points are the same for all experimental units is considered. The influence of these variables on estimation of polynomials by two methods: Potthoff–Roy’s and iterative is examined. The investigation is carried out on the data obtained by computer simulation.

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