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Forecasting


These irregular events made people stop to go out of the country. Thus, it shows that the time data series during year 2003 has a weak seasonal component. However, it appears that the number of resident departures rapidly increasing in May and continues to increase in June. This is because the irregular events turned back to be a normal situation. This can be assumed that the trend data series would be back to a seasonal component. .
             To forecast a data set for one year ahead, it needs to use the actual data and apply a several forecasting models in order to find the best fit model. In this case, it needs to remove the most recent observation from the actual data. The decision has selected the data from January 2000 to June 2003. The reason of choosing the last three years is that the data set has a seasonal component which occurs weakest/strongest regularly at a particular time of the year. Therefore, it does not need to take all the data set. Another reason to choose a three year data is that the data has a stable pattern during these years. Although there were unpredictable events in 2003, but it is not significant to see as a whole vision. .
             In the case to select the actual data more than three years, it would be inappropriate action to apply with forecasting models. This is because the data set in 1999 has shown a low amount in resident departures in 1999 compared to year 2000 to 2002. In this case, it would be difficult to find the best fit model. Thus, the decision should be selecting the data from year 2000. The removal data from Jan 2000 to June 2003 is shown as in Appendix A.
             2.2 Deseasonalising the Data.
             After the decision has been made, the selected data needs to apply the Ratio Moving Average method to compute the Seasonal Indices (SI) (See Appendix B). The findings of this method will show the highest and lowest data for the resident departures. From this findings, it shows that the resident departures for business are regularly highest in May, (10% above the average) and the resident departures for business regularly lowest in December, (38% below the average).


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