Re: ZSAV format support [ZCOMPRESSED subcommand]

[Hugo Alejandro]

Attached larger files.

*.sav file   = 4.6 MB in disk
*.zsav file = 234.6 kb in disk

The compression ratio is not always proportional, but here a sample that can do a lot (I'm very surprised).

I have not been able to make objective evidence, however, I have been working with files up to 1 GB of disk size (zsav), and really not noticeable performance down to use the same file (sav format almost 2 GB).

Thank you for your attention.

2013/10/3 Bastián Díaz <address@hidden>

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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ZSAV_file.tar.xz
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