Event Study analysis of share price and stock market index data. Marco Giuliani Supervisor – Dr Mario Kolberg “An Event Study is a statistical method to.

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Presentation transcript:

Event Study analysis of share price and stock market index data. Marco Giuliani Supervisor – Dr Mario Kolberg “An Event Study is a statistical method to assess the impact of an event on the value of a firm”

Event study is used for post analysis of an event. – Did a firm lose/gain value because of an event and can this be proven? Event study can also be used for forecasting the likely change in stock prices given a forthcoming event.

Required information for event study Event Date – From which you derive; An estimation period An event window Historical stock prices – Close price and dates Market index stock prices – S&P500, FTSE....

Steps involved to calculate analysis Calculate daily returns for the stock and index over the estimation period Use regression analysis to estimate the security characteristic line (SCL) from the estimation period. This gives us values to estimate what the expected return of the stock should be if no event was to occur. SCL: r s = a + B( r m ) + e Using the expected return calculated over the event window, the abnormal returns (AB) can be calculated for the event window using a combination of market models. AB = r s - E ( r s) Calculate the cumulative abnormal returns (CAR) and average abnormal returns (AAB) over the event window and carry out significance testing on the result to indicate if the event caused a significant change in the stock value CAR j,t = ∑ -T t AB j,t

Technology Used Front end – Web based, html page design and UI developed using JQuery. Middle tier - jsp / servlets used to produce the html pages and running on tomcat servlet container. MVC design pattern used to structure the code sequence. Back end analysis – R statisical package running Rserve. Rserve is a TCP/IP server which allows other programs to use facilities of R

Web interface (Thin Client) Server running Tomcat, R, and Rserve Internet Google Finance Yahoo Finance CRSP

Controller Model View Request (http....) Response (html....) Demand Data MVC Design Pattern

Web Interface

New Event Study

Lightbox Image Viewer (jQuery)

Example Graphs Stock & Index PriceRhat v Actual ReturnCumulative Ab Return

Questions?