Víšek, J. Á.: Instrumental weighted variables under heteroscedasticity. Part II. Numerical study.
| Author(s): | prof. RNDr. Jan Ámos Víšek CSc., |
|---|---|
| Type: | Articles in journals with impact factor |
| Year: | 2017 |
| Number: | 53 |
| ISSN / ISBN: | 0023-5954 |
| Published in: | Kybernetika 53, 26 - 58. |
| Publishing place: | Praha |
| Keywords: | Heteroscedasticity of disturbances, numerical study of instrumental weighted variables. |
| JEL codes: | |
| Suggested Citation: | |
| Grants: | DYME – Dynamic Models in Economics |
| Abstract: | Results of a numerical study of the behavior of the instrumental weighted variables estimator - in a competition with two other estimators - are presented. The study was performed under various frameworks (homoscedsticity/heteroscedasticity, several level and types of contamina- tion of data, ful lled/broken orthogonality condition). At the beginning the optimal values of eligible parameters of estimatros in question were empirically established. It was done under the various sizes of data sets and various levels of the contamination of data. These values were then utilized in the numerical study. Its results indicate that instrumental weighted variables are as good as S- and W-estimators and under heteroscedasticity even better. The weight function of Tukey's type was used. |
