这个作业是用R语言完成一个建筑模型并编写相关的报告

The course project is an opportunity for students to apply time series techniques to real-world problems. Data and

software for the project can be obtained from various Internet sites, or developed by students.

You are encouraged to collaborate on this project with the rest of the class – feel free to discuss your ideas with

other students. The “deliverables”, however, should be unique to you. Your project will be graded on its merits;

plagiarism will result in a score of 0.

Deliverables and deadlines. There will be two “deliverables” on this project.

Project report is due on March 13th, 2020. Submit in one pdf file by e-mail to feldman@pstat.ucsb.edu. The

subject line of your e-mail must start with your first and last name, e.g., Raya Feldman – PSTAT 274 final project

submission. Please use the following format for the name of the file, e.g., Raya Feldman-174 final project.pdf .

Project defense is required in addition to a written report. It should take place during finals week or before;

scheduling of the defense is your responsibility. Please prepare a 5-minutes summary of your findings.

Project Report. The project report should contain the following:

1. Abstract or Executive summary should be one–two short paragraphs summarizing briefly the questions you addressed,

your time series techniques, key results, and conclusions.

2. The main body of the report should cover the following:

Introduction. Restate your problem, including details. Describe the data set and explain why this data set is

interesting or important. Provide a clear description of the problem you plan to address using this dataset (for

example to forecast) and include techniques you use. Describe results (positive and negative) and briefly state your

conclusions. Please acknowledge the source of your data and software used.

Sections.

• Plot and analyze the time series. Examine the main features of the graph, checking, in particular, whether

there is (i) a trend; (ii) a seasonal component, (iii) any apparent sharp changes in behavior. Explain in detail.

• Use any necessary transformations to get a stationary series. Give a detailed explanation to justify your choice

of a particular procedure. If you have used transformation, justify why. If you have used differencing, what lag

did you use? Why? Is your series stationary now?

• Plot and analyze ACF and PACF to preliminary identify your model(s). Explain your choices of suitable p

and q here.

• Fit your model(s): Estimate the coefficients and perform diagnostic checking. Compare at least two models

to choose the final model and explain how you decided on your “best” model. Is the model obtained by using

AIC(C) the same as one of the models suggested by ACF/PACF? Write the fitted model in algebraic form. Do

you conclude from the analysis of residuals that your model is satisfactory?

• Do forecasting. Make sure to include confidence intervals. Make sure to return to original data. Plot the

original series and the forecasts.

• Only for PSTAT 274 students: Perform spectral analysis of your model.

3. Conclusion Section. Reiterate your conclusions referring to the goals of your project. Were these goals achieved?

Record the math formula for the model you chose. Acknowledge all individuals who helped you with this project.

4. References.

5. Appendix. Include your code with comments.

Report should not be long; please do not add words for the sake of being wordy. The report must be self-contained,

i.e. if you use formulas, write them. Include all necessary plots either in the body of the report or in appendix.

When including R outputs, analyze the outputs and explain what you plan to do next, why and how.

Time Series Data Libraries:

Please see a separate document with suggested websites for time series data.

Please acknowledge the source of your data in the project. Project diagram – see page 2.

GOOD LUCK !!!

Model building

DATA

Postulate class of models

Identify particular model

(X1

, …, Xn

) = (x1

, … xn

)

Class of models: log/power transforms,

seasonal, non/stationary

Identify p and q for ARMA

using acf/pacf

Estimate model parameters Estimate from data 𝜑 , θ

Diagnostic checking Use model for forecasting

good Results

BAD

Go back

Figure 1: Model Identification Diagram

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