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Transactional vs. Transformational Leadership

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ARCH
An ARCH (autoregressive conditionally heteroscedastic) model is a model for the variance of a time series.

Given the apparent lack of any structural dynamic economic theory explaining the variation in higher order moments, particularly instrumental in this development has been the autoregressive conditional heteroskedastic (ARCH) class of models introduced by Engle (1982).

The ARCH model and its various extensions have proven very effective tools along these lines. In truth, by any yardstick, the literature on ARCH has expanded dramatically since the seminal paper by Engle (1982). It is hope that this overview of the extensive ARCH literature may serve as a catalyst in fostering further research in this important area. Engle, R.F. (1982) “Autoregressive Conditional Heteroskedasticity with Estimates of the Variance of U.K. Inflation”, Econometrica, 50,987-1OO8.

EGARCH
For comparison to the TGARCH and GJR-GARCH above models, a radically different specification is used for the FIB density data. Take the place of the Generalized Error Distribution, asymmetric normal distribution is used. The same variables which are used in other models are used for this specification too. Using the different set then the comparison would have been difficult. Turbidity, rainfall, dew point, and cloud cover are significant variables. In the model specification, the skewed normal is replaced with a normal distribution making it a fixed symmetric GARCH model. The consequence of the model estimation differs from the EGARCH with the skewed normal distribution. In stark contrast, all the exogenous variables are significant.

GJR
The GJR model is a GARCH variant that includes leverage terms for modeling asymmetric volatility clustering. In the GJR formulation, large minus changes are more likely to be get together than positive changes. Glosten, Jagannathan and

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