R help - Apr 2010 - Meaning of "lag 0.2, 0.4,..." ?

Please see that correlogram for a arbitrary time series :

acf(zooreg(rnorm(39), start=as.yearmon("2008-01-01"), frequency=12))

What is the meaning of lag 0.2, 0.4, ........ in the plot? Those should not
be integers? Or I am missing something?

Thanks
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Hi Bogaso,

You could try this to get integer x-axis values:

library(zoo)
z = zooreg(rnorm(39), start=as.yearmon("2008-01-01"), frequency=12)

acf(ts(z,freq=1))

Steve Chen

On 2010/4/8 ?? 03:32, Bogaso wrote:
> 
> Please see that correlogram for a arbitrary time series :
> 
> acf(zooreg(rnorm(39), start=as.yearmon("2008-01-01"),
frequency=12))
> 
> What is the meaning of lag 0.2, 0.4, ........ in the plot? Those should not
> be integers? Or I am missing something?
> 
> Thanks

On Wed, 7 Apr 2010, Bogaso wrote:
>
> Please see that correlogram for a arbitrary time series :
library(zoo) ## you example does not work without it!
> acf(zooreg(rnorm(39), start=as.yearmon("2008-01-01"),
frequency=12))
>
> What is the meaning of lag 0.2, 0.4, ........ in the plot? Those should not
> be integers? Or I am missing something?
You are.  They are in years: you told R that the series was monthly 
with a time unit of years.
>
> Thanks
> -- 
> View this message in context:
http://n4.nabble.com/Meaning-of-lag-0-2-0-4-tp1765093p1765093.html
> Sent from the R help mailing list archive at Nabble.com.
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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