[R] (no subject)

[Lia LEE]

Hello forum members,

I am taking this R course which I have to admit that it is beyond my
capability. I am asked to analyze the following data(file attached) according
to the question provided below:

1. The file [data_13-9.txt] contains a data of length 225, which seems to
have some cycle pattern.
(1) Fit a suitable model for this data, then report the model equation.
(2) Provide the forecast values for 3-steps ahead and 6-steps ahead.

I am desperately seeking for your help, since I really don't know where to
start.. I have done "plot.ts(data.13-6)", but not further. Above question
is just part of the whole task, but I believe solving this would be very
much helpful for me to jump in to the other questions. It would be easier
for me to follow if your answer is in R script..
I appreciate your patience and help.
Thank you so much in advance!

Cheers,
Lia
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fourth_a.ts
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