[R] data usage

[Liaw, Andy]

Is the ca. 100MB the size of the .dta file, or the size of the data when
loaded into Stata?  Or is there not a difference?  Have you checked the size
of the .rda file created as Doug had suggested?  I'd be curious to see what
that is...

Andy

> From: Edwin Leuven
> 
> > What does the 665 MB represent?  Did you try doing a garbage
> > collection after you had done the import?
> 
> i didn't (sorry, R beginner)
> 
> i followed your example and things look much better now, and
> object.size(x) returns:
> 
> 219,167,604
> 
> which is about double the size of the same object in stata where it 
> is:
> 
> 104,882,604
> 
> this leaves quite some room for improvement, but at least i can 
> now handle the data on my laptop...
> 
> thanks for your quick response! edwin
> 
> 
> > I would suggest
> > 
> > library("foreign")
> > x<-read.dta("mydata.dta")
> > gc()              # possibly repeat gc() to lower the thresholds
> > object.size(x)    # the actual storage (in bytes) allocated 
> to this object
> > save(x, file = "mydata.rda", compress = TRUE)
> > 
> > After that you can start a new session and use
> > 
> > load("mydata.rda")
> > 
> > to obtain a copy of the data set without the storage 
> overhead incurred
> > by the stata -> R conversion.
> > 
> > P.S. As described in the help page for object.size, the 
> returned value
> > is more properly described as an estimate of the object size because
> > sometimes it is difficult to determine the object size accurately.
> >
> 
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