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I'm trying to understand time series (TS) objects.  Thought I understood but 
recently have run into a series of error messages that I'm not sure how to 
handle.  I have 15 years of quarterly data and I typically create a TS object 
via something like...

data.ts <- ts(mydata, start = 2002, frequency = 4)

this create a matric as opposed to a vector object as I receive a univariate 
error when I try to decompose the data using the STL function

data.stl <- stl(data.ts, "periodic")
Error in stl(data.ts, "periodic") : only univariate series are allowed

ok so


so to convert to a vector I'll use
data.ts <- as.vector(data.ts)

but then I lose the frequency as the periods as the data becomes frequency = 1
data.ts <- stl <- stl(data.ts, "periodic")
Error in stl(data.ts, "periodic") :
   series is not periodic or has less than two periods.

So am I missing a  parameter or is there a more general/proper way to create a 
time series object? First time I've run into this problem .  I can always 
decompose  via an alternative methods so there are work arounds.  But just 
trying to understand what I'm not doing programmatically at this point.

Jeff Reichman

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