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SCENARIO 16-13
Given below is the monthly time series data for U.S.retail sales of building materials over a specific year.
The results of the linear trend,quadratic trend,exponential trend,first-order autoregressive,second-order autoregressive and third-order autoregressive model are presented below in which the coded month for the 1st month is 0:
Linear trend model:
Quadratic trend model:
Third-order autoregressive::
Below is the residual plot of the various models:
-Referring to Scenario 16-13,the best autoregressive model using the 5% level of significance is
Quality Control Chart
A graphic representation of process data over time, used to monitor the quality of processes.
Central Tendency
A statistical measure that identifies a single value as representative of a dataset, typically through the mean, median, or mode.
Measuring Samples
The act of collecting and analyzing a subset of data from a larger population to draw conclusions or make predictions.
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