SAVASAS

Stata command to save Stata datasets as SAS datatsets.

 

If you want to use savasas, then feel free to use Stata's command

ssc install to download and install saswrapper:

   ssc install savasas , replace

Disclaimer:  There is no warranty on this software either expressed or implied.  This program is released under the terms and conditions of GNU General Public License.

 

About savasas

Programmer:  Dan Blanchette
The Carolina Population Center
The University of North Carolina
Chapel Hill, NC  USA

Date:  27Oct2003

Last updated:  16Aug2010


Save a Stata dataset as a SAS dataset

 

savasas [varlist] [using filename ] [if exp] [in range] [ , replace formats rename check type( version_of_sas_data_file ) messy sascode ]

 

 

Description

savasas saves the Stata dataset in memory as a SAS file.  By default the output dataset will have the same name and be in the same directory, but with the ".sas7bdat" file name extension and contain all observations and every variable in the Stata datafile.  savasas can save to other versions of SAS.  Version 7/8/9:  "*.sas7bdat", Version 6:  "*.ssd01" / "*.sd2" ,  SAS 6 Transport/xport:  .xpt.

The procedure is as follows:
  1. savasas uses Stata's command fdasave to save the dataset in memory temporarily as a SAS xport datafile.

  2. savasas writes a SAS input program to load the dataset into SAS and to assign variable names, labels (and formats).

  3. savasas runs the program in SAS in batch mode to load the xport data

    Note to Windows users:  This is where the Windows operating system will pop-up windows that indicate that SAS is running in batch.  Do not try to close these windows as that will potentially halt savasas.

  4. SAS saves the data as the version of SAS being run on by savasas unless a other version SAS file type is specified.

The maximum length for a string variable is 244 characters.  In such cases, the first 200 characters will be taken and passed on to SAS (this is a limitation of the SAS xport dataset used to transfer data from Stata to SAS).

NOTEsavasas calls SAS to run the SAS program.  This requires the ability to run SAS on your computer.  If you do not have a working copy of SAS, use the sascode option and copy the SAS program (mySASfile_infile.sas) and the xport datafile (mySASfile_infile.raw) to a computer that has a working copy of SAS.  The SAS program will need to be modified to point to the location of the xport datafile.

 

 

Options

replace works like Stata's replace in that it allows you to overwrite the SAS datafile if it already exists.

 

formats specifies to save value labels that exist in the Stata dataset as SAS formats in a SAS formats in a file that will have the same name as the datafile but with the ".sas7bcat" file extension.  This formats catalog file will be created in the same directory as the SAS datafile.   To use this SAS formats catalog file you will need to add code to your program to make SAS aware that this file contains format definitions used by variables in the dataset.  Your code should look something like this:
    libname in "c:\myData";
    options fmtsearch=(in.mySASdataset);
NOTE:  SAS user-defined formats have to be 8 characters or less and cannot end in a number.  This is a list of format names that SAS reserves and thus cannot be user-defined format names:
    best, binary, comma, commax, d, date, datetime, dateampm, day, ddmmyy, dollar, 
    dollarx, downame, e, eurdfdd, eurdfde, strong eurdfdn, eurdfdt, eurdfdwn, eurdfmn, 
    eurdfmy, eurdfwdx, eurdfwkx, f, float, fract, hex, hhmm, hour, ib, ibr, ieee, julday, 
    julian, percent, minguo, mmddyy, mmss, mmyy, monname, month, monyy, negparen, nengo, 
    numx, octal, pd, pdjulg, pdjuli, pib, pibr, pk, pvalue, qtr, qtrr, rb, roman, s370ff, 
    s370fib, s370fibu, s370fpd, s370fpdu, s370fpib, s370frb, s370fzd, s370fzdl, s370fzds, 
    s370fzdt, s370fzdu, ssn, time, timeampm, tod, weekdate, weekdatx, weekday, worddate, 
    worddatx, wordf, words, year, yen, yymm, yymmdd, yymon, yyq, yyqr, z, zd
savasas will make some attempt to rename invalid SAS formats but it would be best for you to rename or drop them yourself before saving to SAS.

 

 

rename specifies that any required renaming of the file name and/or variable names is to be done.  The rename option is only necessary when saving to SAS 6/transport or when variable names are not unique in SAS.  When saving to SAS 6/transport rename attempts to rename long variable names (more than 8 characters) to be unique by shortening all long variable names to the first 8 characters or up to 7 plus a number.  savasas displays the list of renamed variables.  rename also renames the SAS file name when the name provided is not a valid SAS file name.

 

 

 

check specifies that basic stats for both datasets are to be generated to compare the Stata input dataset with the SAS output dataset in order to make sure savasas created the files correctly.  This is a comparison that should be done after any datafile is converted to any other type of datafile by any software.  The SAS file is created in the same directory as the output SAS datafile and is named starting with the name of the datafile followed by "_SAScheck.lst" (SAS), for example:  "mydata_SAScheck.lst" .

 

 

 

type(version_of_sas_data_file) specifies the SAS datafile version desired, from the following list:
one of

SAS version datafile
-------
------------------------------------------------------
sas
SAS version 9  * the default if no type specified *
sas6
SAS version 6
sasx
SAS version 6 transport/xport

Hint:  If you specify the correct file name extension, you do not have to specify type.  Remember that a SAS Version 9 (.sas7bdat) file will be created if no file extension or type specification is made.

SAS version 6 and Transport/xport file restrictions:
  1. File names or variable names cannot be longer than 8 characters.  savasas checks for names that are longer than 8 characters; and, if the rename option is issued, renames them to the first 8 characters or up to 7 plus a number.  In addition, it displays the list of renamed variables.

  2. Variable labels can be a maximum of 40 characters.  savasas saves the first 40 characters.

 

messy specifies that all the intermediary files created by savasas during its operation are not to be deleted.  The messy option prevents savasas from cleaning up after it has finished.  This option is mostly useful for debugging purposes in order to find out where something went wrong.  All intermediary files have a name starting with an underscore ( _ ) followed by the process ID and are located in Stata's temp directory.

 

 

 

sascode specifies that only a SAS xport datafile and an input SAS program are to be created.  By default, savasas executes all four steps outlined above.  The sascode option aborts this process after step 2.  The user then needs to read in the data manually using SAS.  savasas writes a SAS program (mydata_infile.sas) to read in the xport datafile (mydata.xpt).

 

Examples

To save the dataset in memory to the same directory with the same name as the dataset in memory as a ".sas7bdat" file, type:
  . savasas 
To save the dataset in memory to the current directory with the name mySASdata as a ".sas7bdat" file, type:
  . savasas using mySASdata
To save the dataset in memory to c:\data\ directory with the name mySASdata as a ".sas7bdat" file and create 2 check files, type:
  . savasas using "c:\data\mySASdata", check
To save only variables between var1 and var20 from the dataset in memory to the current directory with the name mySASdata as a ".sas7bdat" file and create a "formats.sas7bcat" file containing SAS formats of any Stata value labels, replacing an existing file if necessary, type:
  . savasas gender-q32_b using mySASdata, replace formats
More examples:
  . savasas using mySASdata.sas7bdat, replace

  . savasas in 1/30 using mySASdata, type(sas6) check

  . savasas using mySASdata, messy type(sasx) rename

 

Setting up savasas

If you are setting up this program on your computer for the first time, you may need to edit the sasexe.ado file to set the location of your SAS executable file (sas.exe) .  If you do not, savasas will look in the "usual" locations for it.  savasas also may need to have the location of the SAS macro savastata.sas set.  The sasexe.ado file is an ASCII text file and should be saved as such after editing.  Stata's do-file editor will do the job.

 

Acknowledgements

The user-written program outdat inspired this program.

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