Looks interesting if indeed the file format is more efficient with large data files.
Surfing the net, I have also come to savReaderWriter, but unfortunately this program uses SPSS I/O module to function, it is not your own implementation or fully open source.
Reviewing the websites of other statistical packages (SAS, Stata, etc.) do not support the *.Zsav file format currently, but will support in their next versions, especially Stata is working to extend the command -usespss- for version 14.
--
Bastián Díaz
interestingly,
there is a program already available which could read this format-
savReaderWriter. i did not try it myself, but according to the main page
(http://pythonhosted.org/savReaderWriter/#savwriter-write-spss-system-files),
zsav was created using the ZLIB compression scheme.
searching for more materials.
regards,
Dr Soumalya Ray
<address@hidden>
MBBS,MD(PGT-C.Medicine),Ex-HP(Medicine)
skype:som3776|twitter:@docbkp
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