# EGARCH_GUESS - Initial Values for Model's Parameters

Returns an initial/quick guess of a given model's parameters.

## Syntax

EGARCH_GUESS ([x], order, p, q, f)

[X]
Required. Is the univariate time series data (a one-dimensional array of cells (e.g., rows or columns)).
Order
Optional. Is the time order in the data series (i.e., the first data point's corresponding date (earliest date = 1 (default), latest date = 0)).
Value Order
1 Ascending (the first data point corresponds to the earliest date) (default).
0 Descending (the first data point corresponds to the latest date).
P
Required. Isthe ARCH model component order.
Q
Required. Isthe GARCH model component order.
F
Optional. Is the probability distribution function of the innovations/residuals (1 = Gaussian (default), 2 = t-Distribution, 3 = GED).
Value Probability Distribution
1 Gaussian or Normal Distribution (default).
2 Student's t-Distribution.
3 Generalized Error Distribution (GED).

## Remarks

1. The underlying model is described here.
2. The time series is homogeneous or equally spaced.
3. The time series may include missing values (e.g., #N/A) at either end.
4. The number of gamma coefficients must match the number of alpha coefficients (minus one).
5. The number of parameters in the input argument - [αo α1, α2 … αp] - determines the order of the ARCH component model.
6. The number of parameters in the input argument - [β1, β2 … βq] - determines the order of the GARCH component model.
7. EGARCH_GUESS returns the model's parameters in the following order:
1. $\mu$.
2. $\alpha_o,\phi_1,...,\phi_p$.
3. $\gamma_1,\gamma_2,...,\gamma_p$.
4. $\beta_1,\beta_2,...,\beta_q$.
5. $\nu$.