Group Assignment-TSF GA Group 13.docx - Group Assignment Problem Statement Quarterly beer sales data has been provided in the beer.csv files Part A

# Group Assignment-TSF GA Group 13.docx - Group Assignment...

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Group Assignment Problem Statement Quarterly beer sales data has been provided in the beer.csv files. Part A) Using the Winter-Holts methods, model the data, and predict for the next 2 years. Your submission should contain the complete modelling steps with explanations. Include pictures and R-code where applicable. Part B) Using the ARIMA method model the data and predict for the next 2 years. Your submissions should contain the complete modelling steps with explanations. Include pictures and R-code where applicable. Solution Winter-Holts method 1. Plot the time series and identify if it is Additive or Multiplicative Rcode install.packages("forecast") install.packages("tseries") install.packages("TSA") library (forecast) library (tseries) library (TSA) beer = read.csv("beer.csv",1) attach(beer) ts_beer = ts(beer, frequency = 4) plot(ts_beer, col="blue",main="Beer sales every quarter")
Output Clearly, the pattern repeats itself after every 4 quarters 2. Forecasts from Holt-Winters additive Method # Forecasts from Holt-Winters additive Method for 2 years (8 quarters) forecast(fit,8) plot(forecast(fit,8)) Output

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