如何直接将“.da”文件读入R？(How can I read a “.da” file directly into R?)

 我想与R的健康与退休研究合作 。他们的网站提供“.da”文件和SAS提取程序。 SAS程序读取“.da”文件，如固定宽度文件： 
 
libname EXTRACT 'c:\hrs1994\sas\' ; 

DATA EXTRACT.W2H;
INFILE 'c:\hrs1994\data\W2H.DA'  LRECL=358; 

INPUT 
  HHID $ 1-6
  PN $ 7-9
  CSUBHH $ 10-10
  ETC ETC    
;

LABEL
  HHID ="HOUSEHOLD IDENTIFIER"
  PN ="PERSON NUMBER"
  CSUBHH ="1994 SUB-HOUSEHOLD IDENTIFIER"
  ASUBHH ="1992 SUB-HOUSEHOLD IDENTIFIER"
  ETC ETC
;
 
 1）这是什么类型的文件？ 我找不到有关此文件类型的任何信息。 
 
 2）是否有一种简单的方法可以将其读入R而无需从SAS导出.csv的中间步骤？ read.fwf()有没有办法在没有明确说明数百个变量名的情况下工作？ 
 
 谢谢！ 

I want to work with the Health and Retirement Study in R. Their website provides ".da" files and a SAS extract program. The SAS program reads the ".da" files like a fixed width file:
 
libname EXTRACT 'c:\hrs1994\sas\' ; 

DATA EXTRACT.W2H;
INFILE 'c:\hrs1994\data\W2H.DA'  LRECL=358; 

INPUT 
  HHID $ 1-6
  PN $ 7-9
  CSUBHH $ 10-10
  ETC ETC    
;

LABEL
  HHID ="HOUSEHOLD IDENTIFIER"
  PN ="PERSON NUMBER"
  CSUBHH ="1994 SUB-HOUSEHOLD IDENTIFIER"
  ASUBHH ="1992 SUB-HOUSEHOLD IDENTIFIER"
  ETC ETC
;
 
1) What type of file is this? I can't find anything about this file type. 
 
2) Is there an easy way to read this into R without the intermediate step of exporting a .csv from SAS? Is there a way for read.fwf() to work without explicitly stating hundreds of variable names?
 
Thank you!

原文：https://stackoverflow.com/questions/45109400