Empirical Methods in Finance Homework 5


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Empirical Methods in Finance
Homework 5

Problem 1: VAR implementation
Use the data on quarterly excess stock market returns, the market Dividend / Price ratio,
and the di§erence between the 10-yr Treasury yield and the Fed Funds rate in the excel
spreadsheet “MktRet_DP_TermSpread.xlsx”. The interest rate data is from the FRED
data depository, available online from the St. Louis Fed.
1. Plot each series. Give the sample mean, standard deviation, and Örst order autocorrelation of each series. From the Örst-order autocorrelation, calculate the half-life of
each series (see ARMA notes for exact half-life formula).
2. Estimate a VAR(1). Give the coe¢ cient estimates, their White standard errors, and
the R2
from each regression.
3. Is the VAR stationary?
4. What is the volatility of quarterly expected returns given the return forecasting regression?
5. Plot the one-quarter ahead expected return series. Plot the four quarters ahead expected return series. Plot the twenty quarters ahead expected return series. Comment
on how the persistence of the term spread and the DP-ratio a§ects the expected return
forecasts at di§erent horizons.
6. Plot the impulse-response function for returns from a one standard deviation positive
shock from each of the three shocks in turn using 20 lags. You can do this by simulation.
Start at unconditional averages for the lagged values of all the variables in the VAR
(time t1). Then set the time t shock in row 1 of the VAR to its one standard deviation
value, and set all other current and future shocks to zero. Trace out the response by
simulating future variables using the VAR dynamics. Thatís the impulse-response for
the Örst shock. Then go to the second shock and repeat the procedure just outlined
for the Örst shock, but now set the second shock to its one standard deviation value
and all other shocks to zero, etc.
(it is best to plot the orthogonalized shock version of impulse-response (order the shocks
Term Spread, D/P. and Returns), but it is also Öne if you do it the simple way. The
orthogonalized impulse-response math is given in the appendix)
7. Using 80% of the data as a training sample, report results from an out-of-sample test
for predicting excess market returns where you re-estimate the model at each time t
and get the prediction error for the t + 1 realizations.

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