46 lines
1.9 KiB
Plaintext
46 lines
1.9 KiB
Plaintext
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#------------------------------------------------------------------------------
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# $File: statistics,v 1.3 2022/03/24 15:48:58 christos Exp $
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# statistics: file(1) magic for statistics related software
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#
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# From Remy Rampin
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# Stata is a statistical software tool that was created in 1985. While I
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# don't personally use it, data files in its native (proprietary) format
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# are common (.dta files).
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#
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# Because they are so common, especially in statistical and social
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# sciences, Stata files and SPSS files can be opened by a lot of modern
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# software, for example Python's pandas package provides built-in
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# support for them (read_stata() and read_spss()).
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#
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# I noticed that the magic database includes an entry for SPSS files but
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# not Stata files. Stata files for Stata 13 and newer (formats 117, 118,
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# and 119) always begin with the string "<stata_dta><header>" as per
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# https://www.stata.com/help.cgi?dta#definition
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#
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# The format version number always follows, for example:
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# <stata_dta><header><release>117</release>
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# <stata_dta><header><release>118</release>
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#
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# Therefore the following line would do the trick:
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# 0 string <stata_dta><header> Stata Data File
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#
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# (I'm sure the version number could be captured as well but I did not
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# manage this without a regex)
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#
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# Unfortunately the previous formats (created by Stata before 13, which
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# was released 2013) are harder to recognize. Format 115 starts with the
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# four bytes 0x73010100 or 0x73020100, format 114 with 0x72010100 or
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# 0x72020100, format 113 with 0x71010101 or 0x71020101.
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#
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# For additional reference, the Library of Congress website has an entry
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# for the Stata Data File Format 118:
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# https://www.loc.gov/preservation/digital/formats/fdd/fdd000471.shtml
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#
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# Example of those files can be found on Zenodo:
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# https://zenodo.org/search?page=1&size=20&q=&file_type=dta
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0 string \<stata_dta\>\<header\>\<release\> Stata Data File
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>&0 regex [0-9]+ (Release %s)
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