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variables from the regression which are not correlated with the error term (including<br />

lagged and differenced variables) can be potentially used as valid instrumental<br />

variables; the dynamic panel model is able to identify short and long-run involved<br />

effects (Baltagi 2008). Also, the GMM-System exploits the stationarity restrictions,<br />

while the first-differenced GMM estimator can behave poorly when the time series<br />

are persistent.<br />

The obtained empirical results are presented in the following table:<br />

Table 1 Statistic model results<br />

Dependent Variable: Market returns<br />

Method: Panel Generalized Method of Moments<br />

Transformation: First Differences<br />

White period instrument weighting matrix<br />

White period standard errors & covariance (d.f. corrected)<br />

Instrument specification: Lagged values of returns (from 1 to 3), EPS and ROA (from 1<br />

To 2)<br />

Constant added to instrument list<br />

A) Basic materials (18 companies)<br />

Variable Coefficient Std. Error t-Statistic Prob.<br />

Returns(-1) -1.243457 0.092652 -13.42078 0.0000<br />

EPS(-1) 0.091567 0.022418 4.084497 0.0011<br />

ROA(-1) -18.69844 2.601485 -7.187601 0.0000<br />

ROE(-1) 8.809040 2.473420 3.561482 0.0031<br />

B) Industrial (24 companies)<br />

Variable Coefficient Std. Error t-Statistic Prob.<br />

Returns(-1) -0.963363 0.083750 -11.50283 0.0000<br />

Diluted EPS(-1) -17.34071 10.35401 -1.674782 0.1095<br />

Effective interest rate(-1) -26.85258 7.338023 -3.659376 0.0016<br />

C) Technology, telecommunications, media (19 companies)<br />

Variable Coefficient Std. Error t-Statistic Prob.<br />

Returns(-1) -1.037504 0.139906 -7.415721 0.0000<br />

EPS(-1) 1.349303 0.201852 6.684601 0.0000<br />

D) Energy (29 companies)<br />

Variable Coefficient Std. Error t-Statistic Prob.<br />

Returns(-1) -1.001197 0.085291 -11.73854 0.0000<br />

EPS(-1) -1.940791 0.557147 -3.483446 0.0017<br />

E) Consumer, health (47 companies)<br />

Variable Coefficient Std. Error t-Statistic Prob.<br />

Returns(-1) 0.887278 0.897732 0.988355 0.3286<br />

Current liquidity(-1) 7.336577 1.439564 5.096389 0.0000<br />

Quick ratio(-1) -15.90176 3.375288 -4.711231 0.0000<br />

EPS(-1) 0.506861 0.090912 5.575270 0.0000<br />

(Source: Developed by the author based on data’s supplied by Teletrader Software AG)<br />

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