R help - Nov 2009 - Time Series methods

Hello, I have a quick question about time series methodology. If I want to
display a boxplot of time series data, sorted by period, I can type:

boxplot(data ~ cycle(data));

where data is of class "ts"

Is there a similar method for calculating, say, the median value of each
time step within the series? (So for a monthly data set, calculate median
for all Januarys, all Februarys, all Marchs, etc.)

Thanks,
Tim

	[[alternative HTML version deleted]]

introduce a factor variable with the months and then use tapply?

Kjetil

On Sun, Nov 1, 2009 at 9:07 PM, Tim Bean <timbean at gmail.com>
wrote:
> Hello, I have a quick question about time series methodology. If I want to
> display a boxplot of time series data, sorted by period, I can type:
>
> boxplot(data ~ cycle(data));
>
> where data is of class "ts"
>
> Is there a similar method for calculating, say, the median value of each
> time step within the series? (So for a monthly data set, calculate median
> for all Januarys, all Februarys, all Marchs, etc.)
>
> Thanks,
> Tim
>
> ? ? ? ?[[alternative HTML version deleted]]
>
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