Calculates the Akaike's information criterion (AIC) of a given estimated GARCH model (with corrections to small sample sizes).
Syntax
GARCH_AIC(X, Order, mean, alphas, betas, innovation, v)
 X
 is the univariate time series data (a one dimensional array of cells (e.g. rows or columns)).
 Order
 is the time order in the data series (i.e. the first data point's corresponding date (earliest date=1 (default), latest date=0)).
Order Description 1 ascending (the first data point corresponds to the earliest date) (default) 0 descending (the first data point corresponds to the latest date)  mean
 is the GARCH model mean (i.e. mu).
 alphas
 are the parameters of the ARCH(p) component model (starting with the lowest lag).
 betas
 are the parameters of the GARCH(q) component model (starting with the lowest lag).
 innovation
 is the probability distribution function of the innovations/residuals (1=Gaussian (default), 2=tDistribution, 3=GED).
value Description 1 (default) Gaussian or Normal Distribution 2 Student's tDistribution 3 Generalized Error Distribution (GED)  v
 is the shape factor (or degrees of freedom) of the innovations/residuals probability distribution function.
Remarks
 The underlying model is described here.
 Akaike's Information Criterion (AIC) is described here.
 The time series is homogeneous or equally spaced.
 The time series may include missing values (e.g. #N/A) at either end.
 Given a fixed data set, several competing models may be ranked according to their AIC, the model with the lowest AIC being the best.
 The number of parameters in the input argument  alpha  determines the order of the ARCH component model.
 The number of parameters in the input argument  beta  determines the order of the GARCH component model.
 GARCH(p,q) model has p+q+2 parameters to estimate.
 The AIC for a GARCH model is defined as:
$AIC = 2(p+q+1)  2\times \ln L^*$
Where:
 $\ln L^*$ is the loglikelihood function.
 $T$ is the number of nonmissing values.
 $p$ is the order of the ARCH component model.
 $q$ is the order of the GARCH component model.
Examples
Example 1:


Formula  Description (Result) 

=GARCH_AIC($B$2:$B$32,1,$D$3,$D$4:$D$5,$D$6)  Akaike's information criterion (AIC) for Guassian Distribution (96.013) 
=GARCH_AIC($B$2:$B$32,1,$D$3,$D$4:$D$5,$D$6,2,5)  Akaike's information criterion (AIC) for tDistribution with Freedom = 5 (103.0997) 
=GARCH_AIC($B$2:$B$32,1+$D$14,$D$3,$D$4:$D$5,$D$6,3,2)  Akaike's information criterion (AIC) for GED with Freedom = 2 (96.013) 
Files Examples
Related Links
References
 Hamilton, J .D.; Time Series Analysis , Princeton University Press (1994), ISBN 0691042896
 Tsay, Ruey S.; Analysis of Financial Time Series John Wiley & SONS. (2005), ISBN 0471690740
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