On Thu, 17 Feb 2011, Nasila, Mark wrote:

Dear Sir/Madam,



 I would like to know what is the maximum number of observations a
single file must have when using R. I am asking this because am trying
to do research on banking transactions and i have around 49million
records. Can R handle this? Advise with regard to this.

Depends on the platform and how many fields there are in a record. (On a 64-bit platform we have handled databases of 70m records and about 30 fields: we did use a DBMS to store them, though: see the 'R Data Import/Export Manual'.)

OTOH, one could ask what extra useful information there is in 49m records over a 1% sample. (In our case it was rare combinations, and we simply extracted those separately from the DBMS.)

Mark Nasila
Quantitative Analyst
CBS Risk Management

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Brian D. Ripley,                  rip...@stats.ox.ac.uk
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