ࡱ> vxuBq` 0bjbjqPqP ::'HHH\22282tl3\84H64|6|66q88 86888888$hWX\H:O8"q8::\|66q???:J8|6H66?:6??Z0HN64 0~2<f.N0|0>ZNHNL8L86?!9,M93888\\?j888::::\\\d*2\\\2\\\  ͷ MSC/POSTGRADUATE DIPLOMA IN FINANCIAL MATHEMATICS MA 5109 FINANCIAL TIME SERIES ANALYSIS THREE HOURS September 2009 Answer FIVE questions and NO MORE. _________________________________________________________________________ Question 1 (a)Define of the following forecasting accuracy measures: Percentage Error (PE), Mean Percentage Error (MPE), Mean Absolute Percentage Error (MAPE), and Residuals Standard Error (RSE). What is meant by white noise in statistical terms? How can we detect whether a series has the properties of white noise? (b)Define what is an autocorrelation function (ACF)? What do the patterns of ACFs look like for the following common time series patterns? (i)Random series; (ii) Random-walk series; (iii) Trending series; (iv) Quarterly seasonal series. Question 2 (a) For the AR(2) process,  EMBED Equation.3 , prove that  EMBED Equation.3   EMBED Equation.3  (b) For the MA(2) process,  EMBED Equation.3 , prove that  EMBED Equation.3   EMBED Equation.3  How are the patterns and forecasts of a time series related? Why are graphs so important in forecasting analysis even when computers and expert systems are used to forecast? Question 3 (a)One university is facing increasing enrollments in its Postgraduate Master program. Below find the number of students enrolled for Fall (FA), Spring (SP), and Summer (SU) semesters over the last 4.3 years. FASPSUFASPSUFASPSUFASPSUFA90917711810984129123100160148128182(i) What is the annual trend for enrollments? (ii) Calculate the seasonal indexes from additive and multiplicative method. (iii) Forecast the enrollments for the fifth years and comments on the validity of the additive model and the multiplicative model. (b)Given the number of robberies in the United states per 100,000 people is 1980198119821983198419851986198719881989251269239217205209225213221233(i) Forecasting 1982 to 1990 using a simple two-period average. (ii) Comment on your results from (a). Is this a good model? (ii) Forecast 1982 to 1990 using simple exponential smoothing with an alpha (() you believe is best. (iv) Comment on you results from (c). Which method is better? Why? Question 4 Suppose that  EMBED Equation.3  and  EMBED Equation.3  (a) Derive the unconditional Variance and mean of Xt and Yt series. (b) Derive the Variance of the forecast error for the optimal one-step and two-step forecasts of each of and mean of Xt and Yt series. (c) Find the values of  EMBED Equation.3 and  EMBED Equation.3 that makes Xt and Yt equally predictable (according to their variance of their forecast errors) for one-step and two-step forecasts. (d) Given these values, which variable is easier to predict these three steps ahead? Question 5 (a)Show that an AR(p) model for  EMBED Equation.3 leads to an ARCH(p) model for the conditional variance. (b) Derive an expression for the unconditional variance of a GARCH(2,2) process, assuming that the process is covariance stationary. (c) Show that a stationary GARCH(1,1) model can be re-written as a function of the unconditional variance,  EMBED Equation.3 ; and the deviations of the lagged conditional variance and lagged squared residual from the unconditional variance. (d). Using the alternative expression for a GARCH(1,1) from part (a) derive the two-step ahead predicted variance for a GARCH(1,1) as a function of the parameters of the model and the one-step forecast. That is, let  EMBED Equation.3 ; and derive  EMBED Equation.3  as a function of ( EMBED Equation.3 ) and  EMBED Equation.3  (e). Derive the two-step ahead predicted variance for a GARCH(1,1),  EMBED Equation.3 ; and infer the general expression for a h-step ahead forecast,  EMBED Equation.3  : In what financial application might we be interested in a h-step ahead forecast? Question 6 (a)What is meant by the term 'Granger causality'? (b) Explain how to test the Granger causality. (c) Following outputs were obtained as a result of an analysis performed using 2 time series which are related to Finance, X and Y: Table 6.1 Dependent Variable: X Method: Least Squares Sample (adjusted): 2 249 Included observations: 248 after adjustments Variable Coefficient Std. Error t-Statistic Prob.X(-,1) 1.000082 0.000714 1399.820 0.0000R-squared 0.977753 Mean dependent var 5515.558 Adjusted R-squared 0.977753 S.D. dependent var 417.1659 S.E. of regression 62.22278 Akaike info criterion 11.10334 Sum squared resid 956303.5 Schwarz criterion 11.11751 Log likelihood - 1375.815 Durbin-Watson stat 1.604346 Table 6.2 Dependent Variable: X Method: Least Squares Sample (adjusted): 2 249 Included observations: 248 after adjustments Variable Coefficient Std. Error t-Statistic Prob.X(-1) 0.980241 0.027745 35.33031 0,0000 Y(-1) 0.105707 0.147768 0115357 0.4751Variable Coefficient Std. Error t-Statistic Prob. R-squared 0.977799 Mean dependent var 5515.558 Adjusted R-squared 0.977708 S.D. dependent var 417.1659 S.E. of regression 62.28437 Akaike info criterion 11.10933 Sum squared resid 954318.3 Schwarz criterion 11.13766 Log likelihood - 1375.557 Durbin-Watson stat 1.582579 Table 6.3 Dependent Variable: Y Method: Least Squares Included observations: 248 after adjustments Variable Coefficient Std. Error t-Statistic Prob.Y(-1) 1.000176 0.000715 1398.015 0.0000R-squared 0.978257 Mean dependent var 1035.630 Adjusted R-squared 0.978257 S.D. dependent var 79.34141 S.E. of regression 11.69922 Akaike info criterion 7.760945 Sum squared resid 33807.31 Schwarz criterion 7.775112 Log likelihood - 961.3572 Durbin-Watson stat 1.962210 Table 6.4 Dependent Variable: Y Method: Least Squares Sample (adjusted): 2 249 Included observations: 248 after adjustments Variable Coefficient Std. Error t-Statistic Prob.X(-I) 0.013242 0.005153 2.569669 0.0108 Y(-1) 0.929672 0.027446 33.87219 0.0000R-squared 0.978826 Mean dependent var 1035.630 Adjusted R-squared 0.978740 S.D. dependent var 79.34141 S.E. of regression 11.56874 Akaike info criterion 7.742521 Sum squared resid 32923.56 Schwarz criterion 7.770855 Log likelihood - 958.0726 Durbin-Watson stat 1.935930 (a)Stating any assumptions you made, test the following hypothesis: (i) X Granger causes Y (ii) Y Granger causes X (b)Which causal direction is stronger? Question 7 (a) What is meant by cointegration? (b) State two methods of testing cointegration (c) An analysis was performed to investigate whether two time series, EMBED Equation.3 and EMBED Equation.3 are cointegrated. The results of the different steps of the testing procedure can be summarised as below: Table 7.1: Test statistics and p-values of Augmented Dickey-Fuller (ADF) test performed on series EMBED Equation.3 and EMBED Equation.3 SeriesI(1) vs. I(0)I(2) vs. I(1)Test Statisticp value Test Statisticp value X1-2.1300.233-38.1910.000X2-2.0620.261-38.5010.000 Table 7.2: EViews' output of the Least Squares Regression for X1on X2 Dependent Variable: X1 Method: Least Squares Included observations: 1527 Variable Coefficient Std. Error t-Statistic Prob.X2 0.882766 0.000578 1527.110 0.0000 C 0.009405 0.001121 8.387173 0.0000R-squared 0.999347 Mean dependent var 1.716236 Adjusted R-squared 0.999346 S. Dependependent var 0.139328 S.E. of regression 0.003563 Akaike info criterion -8.435178 Sum squared resid 0.019359 Schwarz criterion - 8.428196 Log likelihood 6442.259 F-statistic 2332064. Durbin-Watson stat 0.963106 Prob(F-statistic) 0.000000 Table 7.3: Results of the Augmented Dickey-Fuller (ADF) test applied to the residual series (error terms) of the model given in Table 2.2 SeriesI(1) vs. I(0)Test Statisticp value X1-2.1300.233X2-2.0620.261 (a)Using the given information, test whether the two series, EMBED Equation.3 and EMBED Equation.3 , are cointegrated. Explain each step of the test you used. (b)Suppose that the two series are cointegtared. Write down the coinegration vector. Question 5 Given a seasonal indexes of sales for the ABC company are as following: MonthJanuaryFebruaryMarchAprilMayJuneJulySeasonal Index.78.891.011.011.201.251.20Sales10,00015,000?The sales of this Company increased from 10,000 in January to 15,000 in April of the same year. Estimate the monthly trend between January and April? Using this information to forecast the sales of May through July.(25%) Suppose a student has collected data on the use of the university library on an hourly basis for twelve consecutive Mondays in this semester. What type of seasonality would you expect to be in these data. Under what conditions would you choose to use simple exponential smoothing, Holts exponential smoothing and Winters exponential smoothing? The smoothing factor chosen in simple exponential smoothing determines the weight to be placed on different terms of time-series data. If the smoothing factor is high rather low, is more or less weight placed on recent observations? If ( is 0.3 what weight is applied to the observation four periods ago? Write the backshift operator equation and forecasting expression for the ARIMA(2,1,3)4 model. Q1. (a) Express the following ARIMA models in a backshift operator equation and also express in a forecast equation form. ARIMA(0,1,0)0,0(3,1,1)4 , ARIMA(0,0,0)1,1(0,1,1)12 (b) Why you may need to generate logarithmic transformation of a series to build the ARIMA model?     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