# Six basic question on statistic

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Please download the doc below and see questions. This assignment may using Jmp or R to create a simple figure, so I also upload the data also.

Statistics 451 Spring 2019 Assignment 1 1. Briefly explain the difference between a time series with a cycle and a time series with a periodicity. 2. Why do we refer to time series with periodicity as “seasonal time series?” 3. Transforming data can be useful for modeling and data analysis because transformations (such as a log transformation) can be used to simplify the structure of the data. Name at least two features of a time series that could be affected by doing a log transformation. 4. The “decomposition” is a classical time series analysis method. Briefly explain possible motivation for using this method. 5. The usual time series plot is like a scatter plot of the response versus time, but plotting likes connecting the points instead of the points. It is, however, possible to add the points to the plot, if desired. Briefly explain why the points are generally not plotted and also explain why or when it might be useful to plot the points too. 6. For each of the following data sets, make a plot of the data versus time and comment on the features that you see in each time series. The time sequence in each of these data sets is read across, line-by-line. You can use Excel, R, JMP or any other software to make the plots. • The file boston_robberies.txt (also see BostonRobberies.csv) gives the number of robberies in Boston in each month from January 1966 to October 1975. • The files spot.txt and spot.csv give the smoothed number of observed sunspots for each year 1770 to 1869. • The file ozone.txt and ozone.csv give the measured amount of ozone (a pollutant caused primarily by automobile emissions) in the air in downtown Los Angeles from January 1955 to December 1972 in units of parts per hundred million (pphm). • The file load.txt and load.csv give the monthly peak load for electricity in Iowa from January 1970 to December 1979 in units of Millions of Kilowatt-hours. Note: data sets for this and other assignments can be found in the Datasets folder under Modules in Canvas.

ProfAlston
School: Boston College

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Assignment 1
1. Time series with a cycle and time series with a periodicity
The difference between time series with a cycle and time series with a periodicity has
to do with how regular the period of change is. Time series with a periodicity is strictly
regular, implying that there is a precise and defined amount of time between the throughs and
the peaks of the data. Temperature, for instance, would exhibit such behavior. The warmest
and coldest day of the year may move as a result of other factors other than time that
influence the data. However, one will never see the drift over time where there is finally
Winter in the northern hemisphere in June. A time series with a cycle, on the other hand,
drifts over time considering that the periods are not precise. An example would be the stock
market that tends to cycle periods of low and high ...

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Anonymous
Tutor went the extra mile to help me with this essay. Citations were a bit shaky but I appreciated how well he handled APA styles and how ok he was to change them even though I didnt specify. Got a B+ which is believable and acceptable.

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