R-listers:

I may be asking too much from R, but is there a way to use time indexing 
on a time series object.  For instance:

> tsobject <- ts(1:12, start =1999, freq = 4)
> tsobject
     Qtr1 Qtr2 Qtr3 Qtr4
1999    1    2    3    4
2000    5    6    7    8
2001    9   10   11   12
> tsobject[1999,Qtr4]
Error in NextMethod("[") : Object "Qtr4" not found

I would like tsobject[1999,Qtr4] (or something close to that) to return 4, 
not the error.

Any suggestions?

Thanks,

Jason Higbee
Research Analyst
Federal Reserve Bank of St. Louis

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