[R] Meaning of "lag 0.2, 0.4,..." ?

[Prof Brian Ripley]

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
> -- 
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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