[R] time series - cbind

[David Winsemius]

On Oct 28, 2011, at 10:32 AM, Joe Stuart wrote:

> Hi,
> I have a time series ts.score that gets created based on a function.
> When I print the time series out it prints two rows, first the date
> then the value.
>
> 2011-06-14
> -1.25947868
>
> The function gets called multiple times in my script and I'm trying to
> append the time series to an object called ts.bind using the cbind
> function like so. The only problem I have is that the date is an index
> for all of the columns, which is only correct for the first column. Is
> there a way that I can associate the correct dates with each column?

You should look at the 'zoo' package. It supplies merge and cbind  
methods for its zoo-class objects that will properly align values by  
their index. Many people have experienced the problems you are  
currently seeing and .... "zoo" is the solution.

>
> ts.bind <- cbind(ts.bind, ts.score)
>
>                        ts.score          ts.score          ts.score
>    ts.score        ts.score
> 2010-10-14   1.06493449   0.96323675   1.13255734   -0.3060238     
> 1.0083540
> 2010-10-15   0.51371978  -0.54348798   0.82563515   -0.8808261     
> 0.9578659
> 2010-10-18   0.03667826   0.25904910   0.56100008   -1.0084433     
> 0.5220185
> 2010-10-19  -2.32490163   0.08469947   0.09021838   -1.7677688     
> 0.7954248
> 2010-10-20  -1.52627229   0.15408516   0.16440753   -1.4923426     
> 0.5221617
>
> I appreciate any help.
>
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David Winsemius, MD
West Hartford, CT