Online Appendix: High Frequency Newswire Textual Sentiment Analysis: Evidence From International Stock Markets During The European Financial Crisis
Luxembourg School of Finance
December 31, 2015
Abstract:
This is the internet appendix for "High Frequency Newswire Textual Sentiment Analysis: Evidence from International Stock Markets during the European Financial Crisis".
The paper "High Frequency Newswire Textual Sentiment Analysis: Evidence from International Stock Markets during the European Financial Crisis" to which this Appendix applies is available at: http://ssrn.com/abstract=2572597.
Online Appendix: High Frequency Newswire Textual Sentiment Analysis: Evidence From International Stock Markets During The European Financial Crisis - Introduction
Table 1: Portugal Stock Market - 30 minutes. The model I employ the study the effect of the content of news in high frequency stock returns is the following: 
where Mt takes the value of, the positive (Gt), the negative (Bt), the pessimism (Pt) and the news count (Nt), of the previous 30-minute interval, as defined in Section 3.5 of the paper. I control for five lags of returns (i.e. five 30-minute lagged returns for every stock market) to deal with autocorrelation in the returns. The regressions I perform are robust, using the Huber-White sandwich estimators (Huber (1967), White (1980)) to deal with autocorrelation, heteroskedasticity, heterogeneity and lack of normality.
Table 2: Ireland stock market - 30 minutes. The model I employ the study the effect of the content of news in high frequency stock returns is the following: where Mt takes the value of, the positive (Gt), the negative (Bt), the pessimism (Pt) and the news count (Nt), of the previous 30-minute interval, as defined in Section 3.5 of the paper. I control for five lags of returns (i.e. five 30-minute lagged returns for every stock market) to deal with autocorrelation in the returns. The regressions I perform are robust, using the Huber-White sandwich estimators (Huber (1967), White (1980)) to deal with autocorrelation, heteroskedasticity, heterogeneity and lack of normality.
Table 3: Italy stock market - 30 minutes. The model I employ the study the effect of the content of news in high frequency stock returns is the following: where Mt takes the value of, the positive (Gt), the negative (Bt), the pessimism (Pt) and the news count (Nt), of the previous 30-minute interval, as defined in Section 3.5 of the paper. I control for five lags of returns (i.e. five 30-minute lagged returns for every stock market) to deal with autocorrelation in the returns. The regressions I perform are robust, using the Huber-White sandwich estimators (Huber (1967), White (1980)) to deal with autocorrelation, heteroskedasticity, heterogeneity and lack of normality.
Table 4: Greece stock market - 30 minutes. The model I employ the study the effect of the content of news in high frequency stock returns is the following: where Mt takes the value of, the positive (Gt), the negative (Bt), the pessimism (Pt) and the news count (Nt), of the previous 30-minute interval, as defined in Section 3.5 of the paper. I control for five lags of returns (i.e. five 30-minute lagged returns for every stock market) to deal with autocorrelation in the returns. The regressions I perform are robust, using the Huber-White sandwich estimators (Huber (1967), White (1980)) to deal with autocorrelation, heteroskedasticity, heterogeneity and lack of normality.
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