Hi All,

I have a question about time-series in R. For example, I have a variable
with several years' data (continuous years), while each year has 12 months.
 When use aggregate function, it says that it calculates the annual mean
value of this variable. But I think it's problematic. What does aggregate
give us? And what does the trend in decomposed plots mean? Is it also the
annual mean data? Thank you.

Jenny

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