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184<br />

Table 2 ML estimates <strong>of</strong> the GLARMA model for Jack <strong>in</strong> the Box Inc. (JBX) and Halliburton<br />

Company (HAL)*<br />

Parameter JBX HAL<br />

Pla<strong>in</strong> news impact Flexible news<br />

impact<br />

Pla<strong>in</strong> news impact Flexible news<br />

impact<br />

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

γ 0 0.2079 0.0545 −0.0133 0.0426 0.0806 0.0505 −0.0119 0.0039<br />

γ 1 0.8753 0.0356 0.9275 0.0292 0.3821 0.5177 1.5058 0.0717<br />

γ2 0.3914 0.3761 −0.5219 0.0682<br />

δ1 0.1643 0.0312 0.1234 0.0288 0.2240 0.0181 0.2053 0.0183<br />

δ 2 0.0262 0.1411 −0.1724 0.0164<br />

ζ 1 0.2008 0.0389 0.1602 0.0262<br />

ζ2 −0.1307 0.0257<br />

ν0 −0.0705 0.0507 −0.0879 0.0475 −0.2036 0.1452 −0.0143 0.0041<br />

ν 1 0.0078 0.0080 0.0045 0.0076 0.0097 0.0097 0.0008 0.0005<br />

ν 2 0.0169 0.0085 0.0165 0.0080 0.0115 0.0093 0.0012 0.0006<br />

ν3 −0.0184 0.0183 −0.0251 0.0173 −0.0440 0.0330 −0.0027 0.0011<br />

ν4 −0.0095 0.0119 −0.0154 0.0115 −0.0176 0.0147 −0.0011 0.0007<br />

1<br />

2 1.5755 0.1255 1.5078 0.1190 2.5513 0.1907 2.4963 0.1405<br />

Log-likelihood −0.841361 −0.837540 −0.845520 −0.843532<br />

SIC 0.849680 0.846783 0.847164 0.845474<br />

Q(30) 124.8 (0.000) 57.6 (0.001) 187.8 (0.000) 43.5 (0.009)<br />

Q(50) 160.7 (0.000) 84.5 (0.001) 215.4 (0.000) 61.5 (0.042)<br />

Resid. mean 0.001 0.006 0.000 0.005<br />

Resid. variance 0.974 0.953 1.167 1.152<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 />

ñ=1,809 (JBX), ñ=17,329 (HAL), p-values <strong>in</strong> parenthesis<br />

JBX HAL<br />

R. Liesenfeld et al.<br />

Fig. 7 Estimated diurnal seasonality function <strong>of</strong> the non-zero absolute price changes Si∣Si > 0 for<br />

Jack <strong>in</strong> the Box Inc. (JBX) and Halliburton Company (HAL). The x-axes represents the 23,400<br />

trad<strong>in</strong>g-seconds <strong>in</strong> the NYSE-trad<strong>in</strong>g period (from 9:30 to 16:00 EST)

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