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Time Series for Data Science - R Code used in Time Series: A Data Analysis Approach Using R
there are an issue for Example 4.27 in this page.
Here are url:
https://github.com/nickpoison/tsda/blob/main/Rcode.md#chapter-4
for (t in 2:num){
w[t] = x[t] - para[j]*w[t-1]
}
if t is equal to 2, it mean w[2] = x[2] - w[1], as w[1] now is equal to 0.
As the (4.23), w[1] is mean w[0], so you need change x[2] to x[1], so that we can get real w seires.
I have modified it, please check it.
for (t in 2:num){
w[t] = x[t - 1] - para[j]*w[t-1]
}
In Problem 1.2 on page 14, the text states,
"All of the data are in the dataframe eqexp, but two specific recordings are in EQ5 and EXP6".
So, we should find the variables "EQ5" and "EXP6" in the "eqexp" dataset in the "astsa" package. Unfortunately, I can find no "EXP6", but an "EX6" variable. Could it be that this is the one variable we should use instead of "EXP6"?
Kind regards,
Matt
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