ETW3420 Principles of Forecasting and Applications
Principles of Forecasting and Applications
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Topic 2 Pre-tutorial Activity
In this pre-tutorial activity, you will:
(i) Practice basic functions such as help() and autoplot().
(ii) Determine frequency of data via the frequency() function.
Question 1
Use the help menu to explore what the series gold, woolyrnq and gas represent. These are
available in the forecast package.
help(gold)
help(woolyrnq)
a. Use autoplot to plot each of these in separate plots.
autoplot(gold)
autoplot(woolyrnq)
autoplot(gas)
b. What is the frequency of each commodity series? Hint: apply the frequency() function.
c. Use which.max() to spot the outlier in the gold series. Which observation was it?
which.max(gold)
## [1] 770
Question 1
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