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程序代写案例-BU5565

时间：2021-03-22

1

University of Aberdeen Session 2020-21

Final assessment (70%)

BU5565 – Empirical Methods in Finance Research

RUBRIC: PLEASE READ WITH CARE

There are two sections

Answer any two questions

All questions carry equal marks

Section A

Question 1

1.1) Light records, a vinyl company, is trying to aid its prediction of sales patterns by

looking at the time-series properties of the past 4 years of weekly sales (i.e. 208

weeks). The Table below shows the ACF and the PACF coefficients:

1.1.2) Using a simple “rule of thumb” determine which, if any, of the ACF and

PACF coefficients are significant at the 5% level.

(20%)

1.1.3) Use the Box-Pierce statistic to test the null hypothesis that the first ten

autocorrelation coefficients are jointly zero.

(10%)

1.2) The company is also interested in forecasting the demand of its vinyl. The table

below presents the demand for each of the last 12 months:

Month 1 2 3 4 5 6 7 8 9 10 11 12

Demand 25 30 32 33 32 31 30 29 28 28 29 31

ACF PACF

1 -0.127 -0.127

2 0.104 0.089

3 -0.088 -0.067

4 0.671 0.663

5 -0.124 0.012

6 0.087 -0.013

7 -0.053 0.018

8 0.423 -0.052

9 -0.049 -0.100

10 0.068 0.013

2

1.2.1) Apply exponential smoothing with smoothing constants of 0.7 and 0.8 to

derive forecasts for month 13.

(20%)

1.2.2) Calculate a four-month moving average for each month.

(20%)

1.2.3) Exponential smoothing is used for modelling and generating forecasts of a

series. The Box-Jenkins approach suggests the use of ARMA models and a

different forecasting technique. Critically discuss the latter approach focusing on

the modelling and forecasting processes.

(30%)

Question 2

According to Schmitt et al. (2013), the financial markets are examples of highly non-

stationary systems. The authors argue that “sample averaged observables such as

variances and correlation coefficients strongly depend on the time window in which

they are evaluated”.

2.1) Critically discuss the importance of non-stationary in time series and its various

implications.

(30%)

2.2) To predict the behaviour of a stock market variable, Michael obtains daily closing

data of the main German stock price index (Dax). Data is collected from February 1995

to September 2004, i.e. 2498 observations.

2.2.1) Michael decides to plot the following time series of the Dax index:

Briefly discuss what can be concluded regarding this univariate time series.

(15%)

3

2.2.2) Michael uses the same data to conduct an Augmented Dickey-Fuller

(ADF) test. The output is provided below:

Comment on the implications of the estimation results given above. Based on

the output results, indicate the null and alternative hypotheses of the test. Is your

conclusion in line with the argument of Schmitt et al. (2013)?

(20%)

2.2.3 To draw a conclusion about the most suitable model(s), Michael uses a

correlogram as well as the AIC (Akaike Information Criterion) and BIC (Bayesian

Information Criteria). The outputs are presented below:

Model AIC BIC

AR (1) 1.8856 1.9013

AR (2) 1.8442 1.8677

AR (3) 1.8496 1.8809

ARMA (1,1) 1.8489 1.8723

ARMA (1,2) 1.8482 1.8794

4

Critically discuss the best suitable model(s) based on the above results.

(35%)

Section B

Question 3

3.1) A researcher is interested in examining the short-term relationship between three

cryptocurrencies, Bitcoin returns (y1), Ethereum returns (y2), and Ripple returns (y3).

To do this, the researcher estimates a VAR(2) based on their differenced returns.

However, the researcher believes that 2 lags is too many and wants to restrict the VAR

to 1 lag. Explain how the researcher could test whether this would be valid. The

researcher estimates a VAR(2) and a VAR(1) using 121 observations. ln|∑| is -11.992

for the VAR(2), and -11.692 for the VAR(1).

(30%)

3.2) The researcher conducts the Granger causality test on the differenced returns of

these three cryptocurrencies (BT-Bitcoin, ETH-Ethereum, RPL-Ripple) during 2016-

2020, and finds the results from Granger causality test as follows:

Explain the short-term causal relationship between each of two variables (5%

significance level).

(30%)

3.3) The researcher also wants to find out if there is a long-term relationship between

the three-return series. To examine the long-run relationship between the three series,

the analyst uses the Johansen test and gets the following results:

No. of

CE(s)

Test Statistics 5% Critical

Value

Test Statistics 5% Critical

Value

H0: = 0 = 29.08 21.14 = 44.46 29.79

H0: ≤ 1 = 12.83 14.26 = 14.45 15.49

H0: ≤ 2 = 2.546 3.84 = 2.546 3.84

Explain how many cointegrating relationships are there?

(30%)

Null Hypothesis: Obs F-Statistic Prob.

R_ETH does not Granger Cause R_BT 1543 1.04447 0.3521

R_BT does not Granger Cause R_ETH 0.90074 0.4065

R_RPL does not Granger Cause R_BT 1543 5.55800 0.0039

R_BT does not Granger Cause R_RPL 0.73994 0.4773

R_RPL does not Granger Cause R_ETH 1543 1.68963 0.1849

R_ETH does not Granger Cause R_RPL 1.42511 0.2408

5

3.4) The researcher also estimates a VECM(1) model on these three series, and finds

the results as follows:

What is the long-term relationship between these three series (present in equation

form)?

(10%)

Question 4

4.1) What stylised facts of financial data cannot be explained using linear time series

models?

(20%)

4.2) Which of these features could be modelled using a GARCH (1,1) process?

(20%)

4.3) Why, in recent empirical research, have researchers preferred GARCH (1,1)

models to pure ARCH(p)?

(10%)

Standard errors in ( ) & t-statistics in [ ]

Cointegrating Eq: CointEq1

R_BT(-1) 1.000000

R_ETH(-1) 0.013060

(0.02142)

[ 0.60986]

R_RPL(-1) -0.186089

(0.02033)

[-9.15484]

C -0.001924

Error Correction: D(R_BT) D(R_ETH) D(R_RPL)

CointEq1 -0.998824 -0.607047 -0.056852

(0.03806) (0.07178) (0.07785)

[-26.2460] [-8.45699] [-0.73027]

D(R_BT(-1)) 0.025873 0.296828 -0.021158

(0.02863) (0.05400) (0.05857)

[ 0.90364] [ 5.49633] [-0.36123]

D(R_ETH(-1)) -0.000990 -0.464520 0.050006

(0.01326) (0.02500) (0.02712)

[-0.07465] [-18.5789] [ 1.84408]

D(R_RPL(-1)) -0.123723 -0.100429 -0.574166

(0.01172) (0.02210) (0.02397)

[-10.5591] [-4.54417] [-23.9537]

C -9.29E-06 -1.75E-06 -2.27E-05

(0.00102) (0.00192) (0.00209)

[-0.00910] [-0.00091] [-0.01088]

6

4.4) Describe two extensions to the original GARCH model. What additional

characteristics of financial data might they be able to capture?

(20%)

4.5) Consider the following GARCH (1,1) model:

= + , ⁓ (0,

2)

2 = 0 + 1−1

2 + −1

2

If is a daily stock return series, what range of values are likely for the coefficients

, 0, 1, and ? Based on E-views output below, what is the unconditional variance?

(10%)

4.6) Outline how you would test for the presence of ARCH effects in the residuals

from the following regression:

= + ′ +

Clearly describe the procedure, the variables used, the test statistic and its

hypotheses.

(20%)

END OF EXAMINATION

GARCH = C(2) + C(3)*RESID(-1)^2 + C(4)*GARCH(-1)

Variable Coefficient Std. Error z-Statistic Prob.

C 0.176521 0.072224 2.444083 0.0145

Variance Equation

C 0.523925 0.286534 1.828494 0.0675

RESID(-1)^2 0.125524 0.037335 3.362130 0.0008

GARCH(-1) 0.848657 0.042487 19.97464 0.0000

R-squared -0.000180 Mean dependent var 0.229536

Adjusted R-squared -0.000180 S.D. dependent var 3.948246

S.E. of regression 3.948602 Akaike info criterion 5.364547

Sum squared resid 24042.03 Schwarz criterion 5.378394

Log likelihood -4134.748 Hannan-Quinn criter. 5.369698

Durbin-Watson stat 1.988568

学霸联盟

University of Aberdeen Session 2020-21

Final assessment (70%)

BU5565 – Empirical Methods in Finance Research

RUBRIC: PLEASE READ WITH CARE

There are two sections

Answer any two questions

All questions carry equal marks

Section A

Question 1

1.1) Light records, a vinyl company, is trying to aid its prediction of sales patterns by

looking at the time-series properties of the past 4 years of weekly sales (i.e. 208

weeks). The Table below shows the ACF and the PACF coefficients:

1.1.2) Using a simple “rule of thumb” determine which, if any, of the ACF and

PACF coefficients are significant at the 5% level.

(20%)

1.1.3) Use the Box-Pierce statistic to test the null hypothesis that the first ten

autocorrelation coefficients are jointly zero.

(10%)

1.2) The company is also interested in forecasting the demand of its vinyl. The table

below presents the demand for each of the last 12 months:

Month 1 2 3 4 5 6 7 8 9 10 11 12

Demand 25 30 32 33 32 31 30 29 28 28 29 31

ACF PACF

1 -0.127 -0.127

2 0.104 0.089

3 -0.088 -0.067

4 0.671 0.663

5 -0.124 0.012

6 0.087 -0.013

7 -0.053 0.018

8 0.423 -0.052

9 -0.049 -0.100

10 0.068 0.013

2

1.2.1) Apply exponential smoothing with smoothing constants of 0.7 and 0.8 to

derive forecasts for month 13.

(20%)

1.2.2) Calculate a four-month moving average for each month.

(20%)

1.2.3) Exponential smoothing is used for modelling and generating forecasts of a

series. The Box-Jenkins approach suggests the use of ARMA models and a

different forecasting technique. Critically discuss the latter approach focusing on

the modelling and forecasting processes.

(30%)

Question 2

According to Schmitt et al. (2013), the financial markets are examples of highly non-

stationary systems. The authors argue that “sample averaged observables such as

variances and correlation coefficients strongly depend on the time window in which

they are evaluated”.

2.1) Critically discuss the importance of non-stationary in time series and its various

implications.

(30%)

2.2) To predict the behaviour of a stock market variable, Michael obtains daily closing

data of the main German stock price index (Dax). Data is collected from February 1995

to September 2004, i.e. 2498 observations.

2.2.1) Michael decides to plot the following time series of the Dax index:

Briefly discuss what can be concluded regarding this univariate time series.

(15%)

3

2.2.2) Michael uses the same data to conduct an Augmented Dickey-Fuller

(ADF) test. The output is provided below:

Comment on the implications of the estimation results given above. Based on

the output results, indicate the null and alternative hypotheses of the test. Is your

conclusion in line with the argument of Schmitt et al. (2013)?

(20%)

2.2.3 To draw a conclusion about the most suitable model(s), Michael uses a

correlogram as well as the AIC (Akaike Information Criterion) and BIC (Bayesian

Information Criteria). The outputs are presented below:

Model AIC BIC

AR (1) 1.8856 1.9013

AR (2) 1.8442 1.8677

AR (3) 1.8496 1.8809

ARMA (1,1) 1.8489 1.8723

ARMA (1,2) 1.8482 1.8794

4

Critically discuss the best suitable model(s) based on the above results.

(35%)

Section B

Question 3

3.1) A researcher is interested in examining the short-term relationship between three

cryptocurrencies, Bitcoin returns (y1), Ethereum returns (y2), and Ripple returns (y3).

To do this, the researcher estimates a VAR(2) based on their differenced returns.

However, the researcher believes that 2 lags is too many and wants to restrict the VAR

to 1 lag. Explain how the researcher could test whether this would be valid. The

researcher estimates a VAR(2) and a VAR(1) using 121 observations. ln|∑| is -11.992

for the VAR(2), and -11.692 for the VAR(1).

(30%)

3.2) The researcher conducts the Granger causality test on the differenced returns of

these three cryptocurrencies (BT-Bitcoin, ETH-Ethereum, RPL-Ripple) during 2016-

2020, and finds the results from Granger causality test as follows:

Explain the short-term causal relationship between each of two variables (5%

significance level).

(30%)

3.3) The researcher also wants to find out if there is a long-term relationship between

the three-return series. To examine the long-run relationship between the three series,

the analyst uses the Johansen test and gets the following results:

No. of

CE(s)

Test Statistics 5% Critical

Value

Test Statistics 5% Critical

Value

H0: = 0 = 29.08 21.14 = 44.46 29.79

H0: ≤ 1 = 12.83 14.26 = 14.45 15.49

H0: ≤ 2 = 2.546 3.84 = 2.546 3.84

Explain how many cointegrating relationships are there?

(30%)

Null Hypothesis: Obs F-Statistic Prob.

R_ETH does not Granger Cause R_BT 1543 1.04447 0.3521

R_BT does not Granger Cause R_ETH 0.90074 0.4065

R_RPL does not Granger Cause R_BT 1543 5.55800 0.0039

R_BT does not Granger Cause R_RPL 0.73994 0.4773

R_RPL does not Granger Cause R_ETH 1543 1.68963 0.1849

R_ETH does not Granger Cause R_RPL 1.42511 0.2408

5

3.4) The researcher also estimates a VECM(1) model on these three series, and finds

the results as follows:

What is the long-term relationship between these three series (present in equation

form)?

(10%)

Question 4

4.1) What stylised facts of financial data cannot be explained using linear time series

models?

(20%)

4.2) Which of these features could be modelled using a GARCH (1,1) process?

(20%)

4.3) Why, in recent empirical research, have researchers preferred GARCH (1,1)

models to pure ARCH(p)?

(10%)

Standard errors in ( ) & t-statistics in [ ]

Cointegrating Eq: CointEq1

R_BT(-1) 1.000000

R_ETH(-1) 0.013060

(0.02142)

[ 0.60986]

R_RPL(-1) -0.186089

(0.02033)

[-9.15484]

C -0.001924

Error Correction: D(R_BT) D(R_ETH) D(R_RPL)

CointEq1 -0.998824 -0.607047 -0.056852

(0.03806) (0.07178) (0.07785)

[-26.2460] [-8.45699] [-0.73027]

D(R_BT(-1)) 0.025873 0.296828 -0.021158

(0.02863) (0.05400) (0.05857)

[ 0.90364] [ 5.49633] [-0.36123]

D(R_ETH(-1)) -0.000990 -0.464520 0.050006

(0.01326) (0.02500) (0.02712)

[-0.07465] [-18.5789] [ 1.84408]

D(R_RPL(-1)) -0.123723 -0.100429 -0.574166

(0.01172) (0.02210) (0.02397)

[-10.5591] [-4.54417] [-23.9537]

C -9.29E-06 -1.75E-06 -2.27E-05

(0.00102) (0.00192) (0.00209)

[-0.00910] [-0.00091] [-0.01088]

6

4.4) Describe two extensions to the original GARCH model. What additional

characteristics of financial data might they be able to capture?

(20%)

4.5) Consider the following GARCH (1,1) model:

= + , ⁓ (0,

2)

2 = 0 + 1−1

2 + −1

2

If is a daily stock return series, what range of values are likely for the coefficients

, 0, 1, and ? Based on E-views output below, what is the unconditional variance?

(10%)

4.6) Outline how you would test for the presence of ARCH effects in the residuals

from the following regression:

= + ′ +

Clearly describe the procedure, the variables used, the test statistic and its

hypotheses.

(20%)

END OF EXAMINATION

GARCH = C(2) + C(3)*RESID(-1)^2 + C(4)*GARCH(-1)

Variable Coefficient Std. Error z-Statistic Prob.

C 0.176521 0.072224 2.444083 0.0145

Variance Equation

C 0.523925 0.286534 1.828494 0.0675

RESID(-1)^2 0.125524 0.037335 3.362130 0.0008

GARCH(-1) 0.848657 0.042487 19.97464 0.0000

R-squared -0.000180 Mean dependent var 0.229536

Adjusted R-squared -0.000180 S.D. dependent var 3.948246

S.E. of regression 3.948602 Akaike info criterion 5.364547

Sum squared resid 24042.03 Schwarz criterion 5.378394

Log likelihood -4134.748 Hannan-Quinn criter. 5.369698

Durbin-Watson stat 1.988568

学霸联盟