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Modell<strong>in</strong>g f<strong>in</strong>ancial transaction price movements: a dynamic <strong>in</strong>teger count data model 189<br />

Table 4 ML estimates <strong>of</strong> the GLARMA model with microstructure variables and leverage<br />

effect*<br />

Par. JBX HAL<br />

Estimate Std. dev. Estimate Std. dev.<br />

γ0 −0.1565 0.0439 −0.0279 0.0069<br />

γ1 0.9321 0.0219 1.6822 0.0484<br />

γ2 −0.6891 0.0468<br />

δ1 0.1234 0.0183 0.1630 0.0112<br />

δ2 −0.1445 0.0102<br />

ζ1 0.1852 0.0282 0.1494 0.0158<br />

ζ2 −0.1304 0.0153<br />

ν0 −0.0491 0.0422 −0.0045 0.0016<br />

ν1 0.0077 0.0071 0.0002 0.0003<br />

ν2 0.0156 0.0074 0.0001 0.0003<br />

ν3 −0.0140 0.0151 −0.0007 0.0005<br />

ν4 −0.0095 0.0102 −0.0001 0.0003<br />

1<br />

2 1.2476 0.0808 1.3026 0.0349<br />

β d0 −0.0699 0.0288 −0.0960 0.0109<br />

β d1 0.0748 0.0390 0.0709 0.0157<br />

βv 0 0.2227 0.0208 0.3212 0.0087<br />

βv1 0.0561 0.0228 0.0809 0.0097<br />

β t0 0.0427 0.0216 0.2723 0.0133<br />

β t1 0.0214 0.0178 0.0297 0.0109<br />

Log-lik. −0.824800 −0.811089<br />

SIC 0.839589 0.813928<br />

Q(30) 55.0 (0.000) 49.7 (0.000)<br />

Q(50) 76.6 (0.001) 76.2 (0.000)<br />

Res. mean 0.004 0.002<br />

Res. var. 0.981 1.028<br />

*Dependent variable is the absolute value <strong>of</strong> the size <strong>of</strong> a non-zero price change, S i|S i >0,<br />

p-values <strong>in</strong> brackets<br />

regard<strong>in</strong>g the empirical confirmation <strong>of</strong> various implications from market microstructure<br />

theory are confirmed.<br />

4 Diagnostics based on the predicted price change distribution<br />

So far we have analyzed the <strong>in</strong>dividual components <strong>of</strong> the ICH model – the ACM-<br />

ARMA part for the price direction and the GLARMA part for the price change size<br />

given the price direction – separately. However, the ICH model is a specification<br />

for the overall conditional distribution <strong>of</strong> the transaction price changes. Hence, <strong>in</strong><br />

this section, we check to what extend the merged components <strong>of</strong> the ICH model<br />

are capable to capture the features <strong>of</strong> the observed price change distribution. In<br />

particular, based on the estimates for the model components with microstructure<br />

variables (see Tables 3 and 4), we analyze the goodness-<strong>of</strong>-fit <strong>of</strong> the ICH model.

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