3. Using the following command: > library(T SA) > data(days) we can retrieve a data file named days in R. The data file contains accounting data from the Winegard Co. of Burlington, Iowa. The data are the number of days until Winegard receives payment for 130 consecutive orders from a particular distributor of Winegard products. (The name of the distributor must remain anonymous for confidentiality reasons.) The time series contains outliers that are quite obvious in the time series plot. (a) Estimate the parameters of an ARMA(1,1) model for these data. (b) Estimate the parameters of an MA(2) model for these data. Which model is a better model for this data set?
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SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
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A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
3. Using the following command: > library(T SA) > data(days) we can retrieve a data file named days in R. The data file contains accounting data from the Winegard Co. of Burlington, Iowa. The data are the number of days until Winegard receives payment for 130 consecutive orders from a particular distributor of Winegard products. (The name of the distributor must remain anonymous for confidentiality reasons.) The time series contains outliers that are quite obvious in the time series plot.
(a) Estimate the parameters of an ARMA(1,1) model for these data.
(b) Estimate the parameters of an MA(2) model for these data. Which model is a better model for this data set?
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