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read_dta() reads byte variables as character strings #45

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huftis opened this issue Mar 12, 2015 · 1 comment

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@huftis
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commented Mar 12, 2015

read_dta() seems to convert Stata byte variables to character strings, instead of to integers. If I create a simple Stata file, with variables of type float, double, long, int and byte, here is the result of importing it using read_dta:

> d = read_dta("stata-datatypes.dta")
> sapply(d, class)
     vfloat     vdouble       vlong        vint       vbyte 
  "numeric"   "numeric"   "integer"   "integer" "character"

Version info:

> sessionInfo()
R version 3.1.1 (2014-07-10)
Platform: i386-w64-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=Norwegian-Nynorsk_Norway.1252  LC_CTYPE=Norwegian-Nynorsk_Norway.1252   
[3] LC_MONETARY=Norwegian-Nynorsk_Norway.1252 LC_NUMERIC=C                             
[5] LC_TIME=Norwegian-Nynorsk_Norway.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] haven_0.1.1

loaded via a namespace (and not attached):
[1] Rcpp_0.11.4 tools_3.1.1
@huftis

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commented Mar 12, 2015

Here is the example Stata file I used:
http://huftis.org/nedlasting/stata/stata-datatypes.dta

And here’s some information on Stata data types:
http://www.stata.com/help.cgi?datatypes
It says:

byte, int, and long are said to be of integer type in that they can hold only integers.

@hadley hadley closed this in cab0306 Apr 7, 2015

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