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BE314 Financial Modelling

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  • Course Code: BE314
  • University: University Of Essex
  • Country: United Kingdom

Questions:

Question 1
 
Construct a line chart for your given brand of rice. Comment on any features of interest.
 
Question 2
 
Estimate a model of volume sales using a trend component. In other words, estimate the following:
Where yt = Volume sales in period t
T = Trend
Comment on your findings. How do your findings for the trend variable compare to
your observations in step 1?
Hint : To complete this step, you must create a trend variable.
 
Question 3
 
Refine the model you created in step 2 by adding a seasonal index. In other words, estimate the following:
Where SI = Seasonal Index
Are there any months that exhibit above average sales? What do you think is the reason? How do your findings compare to your observations in step 1? Comment on your findings.
Hint : To complete this step, you must create a seasonal index.
 
Question 4
 
In the mid 2005, the outbreak of a new disease Rhizoctonia Solani had a devastating impact on the rice farming industry all over the world. Known as ‘Sheath Blight’, fear of the disease quickly spread throughout India causing people to avoid consumption of certain brands of rice. Many consumers seek alternative food such as bread as a substitute for the 1 year of the plague. At the same time, sales of certain brands of rice were not affected due to the country of production.
 
 

Answers:

Introduction

One of the major responsibilities of the Agri-Food and Veterinary Authority of India is to supervise and coordinate the production of all the imported agricultural productions of India. Thus, the director of the company is interested to identify and analyse the issues that are related to the economy of rice. Nine major rice brands have been considered for the study. The brands of rice are stored in stores of New Delhi and Mumbai. Nine analysing groups were appointed to analyse nine different rice brands. This group was appointed to analyse the various aspects of rice brand C. The necessary analyses are given in details in the following sections.

Answer 1

There are several time series components. Any time series data always follows any one of the four different types of time series components. The four time series components are discussed as below:

  • Secular Trend: This is the main time series component and it shows the effects of the socio-economic and political factors in the long term. This may be increasing and decreasing trend (Goldthorpe 2016).
  • Seasonal trend: This type of trend shows short term changes in the trend. For example, the sale of winter garments is high in winter than in summer. This trend is repeated over years (Piskorski et al.  2018).
  • Cyclic Movements: The long term oscillations that occur in a time series is known as cyclic movements. In most of the economic data, this type of trend is visible (Rey 2015).
  • Irregular Fluctuations:When there are sudden fluctuations in a data, it is known as irregular fluctuations. These types of fluctuations are usually not expected to be repeated (Costa and Goldberger 2015).

The volume of tonnes of rice (in thousands) consumed is shown with the help of the following line chart. It can be seen from the chart very clearly that the volume of consumption of the chosen brand of rice has shown great fluctuations over the time. There has been observed an increased trend in the consumption volume of rice of Mumbai C. The volume of consumption has increased in some years and has decreased in some other years but overall, there is an increased trend in the consumption volume. This type of trend is seasonal trend.

Answer 2

The volume of sales can be estimated from the given volume over the time by the following equation, which has been obtained as a result of the regression analysis:

Estimated sales volume (yt) = 5.9644 + 0.0044 * Trend (T)

From the computed results, it can be said that in the absence of trend, the estimated sales volume will be 5.964 tonnes. With each unit increase in the trend value, the estimated sales volume increases by 0.004 times. Thus, the increase in the sales volume is very little over the years. This has also been observed from the discussion in part 1 that the volume of consumption increases at a very little rate.

Again, it can be said from the regression analysis that the value of R Square is 0.5151, which indicates that 51.51 percent of the variations in the sales volume can be explained by the trend. From the significance value obtained in table 2.2, it can be said that the model is significant as the significance value is less than the 95 percent level of significance (0.05). The table showing the outputs of the regression analysis is given below:

Table 2.1: Regression Statistics

Multiple R

0.717711731

R Square

0.51511013

Adjusted R Square

0.51317057

Standard Error

0.311014991

Observations

252

Table 2.2: ANOVA

 

df

SS

MS

F

Significance F

Regression

1

25.68973554

25.68973554

265.5809911

3.55113E-41

Residual

250

24.18258121

0.096730325

 

 

Total

251

49.87231675

 

 

 

Table 2.3: Regression Coefficients

 

Coefficients

Standard Error

t Stat

P-value

Lower 95%

Upper 95%

Intercept

5.964398827

0.039301116

151.7615653

3.7224E-248

5.886995345

6.041802309

Trend

0.004389075

0.000269324

16.29665583

3.55113E-41

0.003858643

0.004919508

Answer 3

With the addition of seasonal index, the model developed in question 2 has been refined as follows:

Here SI is the seasonal index. The seasonal indices have been calculated and from the results it can be seen that the seasonal indices for the months of April, May, July and September has been greater than 100. Thus it can be said that these four months exhibit sales of rice above the average sales. The months of April, May, July and September are usually summer and monsoon seasons in India. The production of rice in these seasons are high as rice grows better in this season. As the production of rice is high, the consumption of rice in these seasons are also high. Thus, the sales in these seasons are higher than the average sales. The results of the regression analysis for the revised model is given the following tables 3.1, 3.2 and 3.3. From the R Square value obtained from table 3.1, it can be said that the revised model so developed with the introduction of the seasonal indices can explain 67.53 percent of the variability in the sales of rice of brand C.

Table 3.1: Regression Statistics

Multiple R

0.821814993

R Square

0.675379882

Adjusted R Square

0.672772491

Standard Error

0.254986868

Observations

252

Table 3.2: ANOVA

 

df

SS

MS

F

Significance F

Regression

2

33.6827594

16.8413797

259.0252132

1.46636E-61

Residual

249

16.18955735

0.065018303

 

 

Total

251

49.87231675

 

 

 

Table 3.3: Regression Coefficients

 

Coefficients

Standard Error

t Stat

P-value

Lower 95%

Upper 95%

Intercept

-0.349374969

0.570355201

-0.612556821

0.540728426

-1.472710534

0.773960596

Trend

0.004350414

0.000220834

19.69996125

1.03249E-52

0.003915474

0.004785354

Seasonal Index

0.063186645

0.005698854

11.08760488

1.75403E-23

0.051962542

0.074410748

Table 3.4: Seasonal Indices of the months of the Disease

Month

Seasonal Index

Jun

99.90

Jul

100.77

Aug

99.14

Sep

100.78

Oct

99.14

Nov

98.43

Dec

97.63

Jan

97.59

Feb

97.98

Mar

98.73

Apr

101.48

May

108.42

Answer 4

In the mid 2005, a new disease named Rhizoctonia Solani came into effect and had a devastating effect on the industry that farms rice all over the world. The fear of this disease known as the ‘Sheath Blight’ spread very quickly in India and this made a lot of people avoid rice consumption of certain brands. People had switched to an alternative form of food such as bread for that one year of the plague. Certain rice brand did not have any effect in the sales as India was the country where rice was produced. Now, the effect of this disease has been considered in the model devised earlier and developed. A dummy variable named disease has been introduced which takes the values 0 and 1 where 0 indicates the absence of the disease and 1 indicates the presence of the disease. The developed and revised model is stated as follows.

From the obtained equation, it can be said that there is a positive effect of the disease on the sales of the selected brand of Rice (Mumbai C). In the presence of the disease the sales of rice increases by 0.7488. In the absence of the disease, there is no effect in the estimated sales. The results of the regression analysis of the model revised with the introduction of another variable disease is given in tables 3.1, 3.2 and 3.3. The r square value of the revised model with the introduction of the new variable stating the presence or absence of the disease is 0.8039 (Table 4.1). This indicates that 80.39 percent of the variability in the sales of rice of brand C can be explained with the help of this model. Thus this model can be termed as a model better than the ones developed previously. From the significance value also given in table 4.3 it can be said that the model so estimated is quite significant.

Table 4.1: Regression Statistics

Multiple R

0.896580777

R Square

0.803857089

Adjusted R Square

0.801484393

Standard Error

0.198605028

Observations

252

Table 4.2: ANOVA

 

df

SS

MS

F

Significance F

Regression

3

40.09021537

13.36340512

338.7947378

2.15027E-87

Residual

248

9.782101376

0.039443957

 

 

Total

251

49.87231675

 

 

 

Table 4.3: Regression Coefficients

 

Coefficients

Standard Error

t Stat

P-value

Lower 95%

Upper 95%

Intercept

-0.385030553

0.444248984

-0.866699906

0.386944212

-1.260012511

0.489951405

Trend

0.004350414

0.000172004

25.29256917

1.26152E-70

0.00401164

0.004689188

Seasonal Index

0.063186645

0.004438743

14.23525711

5.15873E-34

0.054444206

0.071929085

Disease

0.748767252

0.05874816

12.74537377

5.9073E-29

0.633058311

0.864476194

Answer 5

Price elasticity of demand captures proportionate change in quantity demanded in response to proportionate change in price (Labandeira, Labeaga and López-Otero 2017). It measures responsiveness of demand for a corresponding price change. Demand changes in response to both own price of the product and price of the related product. When elasticity is computed for capturing demand response for own price, then it is called own price elasticity. Because of the inverse relation between price and demand, own price elasticity has a negative sign. Demand response for change in price of the related product is computed from the cross price elasticity of demand. The sign of cross price elasticity of demand depends on the nature of the relation. For substitute products, cross price elasticity is positive while for complementary goods it is negative.

 

Taking into account the effects of trend, Seasonal Indices, disease, own price and competitor price, the following relationship can be established:

Here,  is the own price of rice in the period t and is the Bth competitor price of the good in period t. s

It can be said from the analysis that the price of Mumbai B brand of rice has been observed as the only significant brand of rice which has an effect on the sales of Mumbai C brand of rice. All the other brands of rice that are available does not have any significant relationship on the sales of Mumbai C brand of rice.

From the obtained relationship, it can be said that the sales of Mumbai C brand of rice increases if the price of that brand falls and if the price of the competitive brand B increases. Thus, the price of brand C must always be kept less than the price of brand B in order to increase the sales.  

Table 5.1: Regression Statistics considering price effects of all rice brands

Multiple R

0.910142885

R Square

0.828360071

Adjusted R Square

0.819742166

Standard Error

0.189251785

Observations

252

Table 5.2: ANOVA considering price effects of all rice brands

 

df

SS

MS

F

Significance F

Regression

12

41.31223582

3.442686318

96.12082374

3.11232E-84

Residual

239

8.560080927

0.035816238

 

 

Total

251

49.87231675

 

 

 

Table 5.3: Regression Coefficients considering price effects of all rice brands and identifying insignificant Price Effects

 

Coefficients

Standard Error

t Stat

P-value

Lower 95%

Upper 95%

Remarks

Intercept

-1.005

0.559

-1.800

0.073

-2.106

0.095

 

Trend

0.004

0.000

25.685

0.000

0.004

0.005

 

Seasonal Index

0.064

0.004

14.782

0.000

0.055

0.072

 

Disease

0.737

0.059

12.514

0.000

0.621

0.853

 

Price C

-0.002

0.000

-4.193

0.000

-0.003

-0.001

 

Price A

0.001

0.000

1.647

0.101

0.000

0.002

drop

Price B

0.001

0.000

3.105

0.002

0.000

0.002

 

Price D

0.000

0.000

0.810

0.418

-0.001

0.001

drop

Price E

0.000

0.000

1.653

0.100

0.000

0.001

drop

Price F

0.000

0.000

0.610

0.542

-0.001

0.001

drop

Price G

0.000

0.000

0.156

0.876

0.000

0.000

drop

Price H

0.000

0.000

-0.374

0.709

-0.001

0.000

drop

Price I

0.000

0.000

1.302

0.194

0.000

0.001

drop

Table 5.4: Regression Statistics dropping out insignificant price effects

Multiple R

0.90727541

R Square

0.823148669

Adjusted R Square

0.81955413

Standard Error

0.189350469

Observations

252

Table 5.5: ANOVA dropping out insignificant price effects

 

df

SS

MS

F

Significance F

Regression

5

41.05233115

8.21046623

228.9997723

2.22832E-90

Residual

246

8.819985594

0.0358536

 

 

Total

251

49.87231675

 

 

 

Table 5.6: Regression coefficients dropping out insignificant price effects

 

Coefficients

Standard Error

t Stat

P-value

Lower 95%

Upper 95%

Intercept

-0.280

0.441

-0.636

0.526

-1.148

0.588

Trend

0.004

0.000

25.949

0.000

0.004

0.005

Seasonal Index

0.063

0.004

14.903

0.000

0.055

0.072

Disease

0.746

0.057

13.106

0.000

0.634

0.859

Price C

-0.002

0.000

-3.942

0.000

-0.002

-0.001

Price B

0.001

0.000

2.968

0.003

0.000

0.002

Answer 6

The Chow test has been developed by The econometrician Gregory Chow in 1960. This test is mainly used to test whether the coefficients of regression analysis on two different datasets are equal. This type of test is mostly used in case of time series data where the structural break present in a trend is tested. Thus it can be said that whether the impact of the independent variable on different subgroups of a dataset are same or different is evaluated with the help of Chow Test (Asteriou and Hall 2015).

Mathematically, If the regression model is , then the regression model can be broken into two periods as  and . The null hypothesis for this test can be given by,

Null hypothesis:

The test statistic for the Chow Test can be given by:  (Nielsen and Whitby 2018).

Here,  denotes the residual sum of squares for the full model,  denotes the residual sum of squares for the first part of the model and  denote the residual sum of squares for the second part of the model,  is the number of observations in first part,  is the number of observations in second part and p = 3.

It can be seen that the test statistic follows an F distribution with  and  degrees of freedom.

For the chow test, the data that has been considered for regression has been divided into two parts, the first group contains data from June 1995 to November 2005 and the second group contains data from December 2005 to May 2016. Regression were run separately on these two groups of data for the Chow test.   From the analysis, the value of the test statistic has been obtained as 4.605 which is greater than the critical value of F at 95 percent level of significance (2.641). This indicates that the null hypothesis is rejected. The regression coefficients of the two separate groups are not equal. Thus, the effect of the independent variables on the dependent variable for both the groups are not same.

Table 6.1: Regression Statistics Group 1

Multiple R

0.854166

R Square

0.729599

Adjusted R Square

0.718333

Standard Error

0.186277

Observations

126

Table 6.2: ANOVA Group 1

 

df

SS

MS

F

Significance F

Regression

5

11.23504

2.247008

64.75717

1.89E-32

Residual

120

4.163879

0.034699

 

 

Total

125

15.39892

 

 

 

Table 6.3: Coefficients of Regression Analysis of Group 1

 

Coefficients

Standard Error

t Stat

P-value

Lower 95%

Upper 95%

Intercept

-0.859

0.648

-1.325

0.188

-2.143

0.424

Trend

0.003

0.000

6.990

0.000

0.002

0.004

Seasonal Index

0.069

0.006

11.337

0.000

0.057

0.081

Disease

0.657

0.086

7.674

0.000

0.487

0.826

Price C

-0.002

0.001

-3.269

0.001

-0.003

-0.001

B

0.002

0.001

3.017

0.003

0.001

0.003

 

Table 6.4: Regression Statistics Group 2

Multiple R

0.840

R Square

0.706

Adjusted R Square

0.693

Standard Error

0.187

Observations

126

Table 6.5: ANOVA Group 2

 

df

SS

MS

F

Significance F

Regression

5

10.041

2.008

57.551

0.000

Residual

120

4.187

0.035

 

 

Total

125

14.228

 

 

 

Table 6.6: Coefficients of Regression Analysis of Group 2

 

Coefficients

Standard Error

t Stat

P-value

Lower 95%

Upper 95%

Intercept

0.071

0.602

0.119

0.906

-1.121

1.264

Trend

0.005

0.000

9.532

0.000

0.004

0.006

Seasonal Index

0.059

0.006

9.892

0.000

0.047

0.071

Disease

0.916

0.087

10.538

0.000

0.744

1.088

Price C

-0.001

0.001

-2.420

0.017

-0.003

0.000

B

0.001

0.001

1.794

0.075

0.000

0.002

Table 6.7: Results of Chow Test

Chow test Statistic

4.605178

Critical F

2.641296

 

 

References

Costa, M.D. and Goldberger, A.L., 2015. Generalized multiscale entropy analysis: application to quantifying the complex volatility of human heartbeat time series. Entropy, 17(3), pp.1197-1203. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4834981/

Goldthorpe, J.H., 2016. Social class mobility in modern Britain: Changing structure, constant process. Journal of the British Academy, 4, pp.89-111. Available at: https://www.britac.ac.uk/sites/default/files/05%20Goldthorpe%201825.pdf

Labandeira, X., Labeaga, J.M. and López-Otero, X., 2017. A meta-analysis on the price elasticity of energy demand. Energy Policy, 102, pp.549-568. Available at: https://www.pubmanitoba.ca/v1/proceedings-decisions/appl-current/pubs/2017%20mh%20gra/irs%20to%20iec/mh-daymark%20%28load%29%20i-12%20-attachment3%20-%20labandeira.pdf.

Nielsen, B. and Whitby, A. (2018). A Joint Chow Test for Structural Instability, available at: https://www.mdpi.com/2225-1146/3/1/156.

Piskorski, J., Kosmider, M., Mieszkowski, D., Krauze, T., Wykretowicz, A. and Guzik, P., 2018. Properties of Asymmetric Detrended Fluctuation Analysis in the time series of RR intervals. Physica A: Statistical Mechanics and its Applications, 491, pp.347-360. Available at: https://www.sciencedirect.com/journal/physica-a-statistical-mechanics-and-its-applications/vol/491

Rey, H., 2015. Dilemma not trilemma: the global financial cycle and monetary policy independence (No. w21162). National Bureau of Economic Research. Available at: https://www.nber.org/papers/w21162

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Awesome work. Awesome response time. Very thorough & clear. Love the results I get with MAH!

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User Id: 383727 - 31 Jul 2020

Australia

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Work was done in a timely manner took it through grammarly checked for plagiarism very well satisfied

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User Id: 463334 - 31 Jul 2020

Australia

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Great work for the short notice given. Thank you for never disappointing and helping out.

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User Id: 194216 - 31 Jul 2020

Australia

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I received a full point on the assignment. Thank you for all the help with the assignment.

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User Id: 411395 - 31 Jul 2020

Australia

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