University of California, Berkeley
Thesis Proposal
-------relation between foreign stock markets and exchange rates
Jian Wang
Background
The idea of the project rose from the summer project I have done in Columbia University about the ADR (American Depositary Receipt). Basically it provides the simple and direct way for U.S. investors to hold the stocks of foreign companies. The price of ADR is influenced by both the price of stock in home country and exchange rate. For instance, the depreciation of Brazilian Real triggered a significant decline of ADR of Brazil in middle 2013. In the summer we have compared the implied volatilities (equivalent to the options price if set interest rate constant) of some ADRs in both home market and U.S. market and built the model to connect them with exchange rate. Then we can estimate the volatility of exchange rate and it turned to be pretty effective using our model to forecast the currency depreciation prior several weeks or even several months. In the estimation of volatility of exchange rate, the expected correlation between foreign stock market and exchange rate played a very critical role and indeed different values of rho here can change the result significantly. For simplicity in the summer we just set the rho as historical correlation from the past. Actually it could be more complex. Thus this semester I plan to make the further exploration about the relation between the foreign stock price and exchange rate.
Description
Nowadays the worldwide stock markets are tightly connected by the exchange rate and interaction between different industries. The correlation between the foreign stock price and exchange rate (to U.S. dollars) is an increasingly significant relation. Yet most results focus on macroeconomics aspects and do not provide the quantities model. In the project I want to first compare the correlation calculated from historical data for different industries as well as different time scale. Different industries respond differently to exchange rate fluctuation. The export-oriented companies may react in the total opposite way compared to import-oriented companies. The correlation between the stock price of the foreign bank and exchange rate may be relatively larger compared to that of other industries. Also the correlation for different time scale (past three months, six months, one year etc) could change similarly for different stocks, which may be affected by macroeconomic factors. I will do multiple tasks in order to find the general pattern of the correlation. Then I can go back to the original problem, that to choose the proper expected correlation between foreign stocks and exchange rate. I believe the efforts on the project could improve the result in predicting the volatility of exchange rate.
Data
Mainly from Bloomberg terminal. List of ADRs. Historical data for stock price, options price, exchange price.
Methods
Different types of regression, time series analysis
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