[R] Matrix Size
paul s
r-project.org at queuemail.com
Thu Jul 15 02:22:37 CEST 2010
On 07/14/2010 06:10 PM, Douglas Bates wrote:
> R stores matrices and other data objects in memory. A matrix of that
> size would require
>> 2e+06*170000*8/2^30
> [1] 2533.197
great, that is my understanding as well..
> probably easier, rethink your problem.
yes. i am starting to do that now as i have run into the same memory
issue with my code and wanted to look at statical packages for crunching
huge amounts of data.
> Results from a linear regression producing 170,000 coefficient
> estimates are unlikely to be useful. The model matrix is essentially
> guaranteed to be rank deficient.
interesting, i also stated this point as observations grew and plotting
the regression had minimal impact on the characteristics, however i am
working with an academic that claims all observations are needed to
reflect a pure hedonic index.
is this what you mean by rank deficient?
http://en.wikipedia.org/wiki/Rank_%28linear_algebra%29
thank you for your response.
cheers
paul
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