Relationship between Greece Bailout Sentiment and Greece Bond Spread

Tuesday, 4 August 2015

Fernando Pratama, Data Scientist,  InfoTrie, Singapore

This report discusses the relationship between the Greece bailout sentiment and Greece bond spread against US bond. Ten-year government yields are used as data. The Greece government bond yield is obtained through this URL and the US government bond yield is obtained through the quantmod package. The yield spread is calculated by subtracting Greece yield with US yield. Here is the yield spread plot for the last three months.

Greece Bailout Sentiment Analysis 01

The sentiment data is obtained through querying InfoTrie articles based o the combination of economics, legal, politics, and security keywords. The articles are then classified into their categories by using support vector machine algorithm. Here are the plots of daily sentiment average for each category.

Greece Bailout Sentiment Analysis 02

In order to find a relationship between Greece bailout news and Greece yield spread, firstly we extract all the news that contain word “bailout” from economics articles and calculate the daily average sentiment. Intuitively, we expect low sentiment results in higher Greece yield spread and vice versa.

Linear regression between yield spread and lagged average sentiments are fitted. Let the Greece yield spread as the target and lagged average sentiment from one to five days as features. Negative values on lagged average sentiments parameters will be the evident for the intuition. Here are the bailout plot and the sample of preprocessed data:

Greece Bailout Sentiment Analysis 06

In order to find the relationship between Greece bailout news and Greece yield spread, firstly we extract all the news that contain word “bailout” from economics articles and calculate the daily average sentiment. Intuitively, we expect low sentiment results in higher Greece yield spread and vice versa.

Linear regression between yield spread and lagged average sentiments are fitted. Let the Greece yield spread as the target and lagged average sentiment from one to five days as features. Negative values on lagged average sentiments parameters will be the evident for the intuition. Here are the bailout plot and the sample of preprocessed data:

Greece Bailout Sentiment Analysis 07

Here is the summary of the linear regression model:

Greece Bailout Sentiment Analysis 04

Greece Bailout Sentiment Analysis 05

The intercept and lag of 1, 2, and 3 day daily average sentiment are significant parameters in the model. The estimated coefficients of lagged daily sentiment are negatives which confirm the intuition.

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