NSPLIT:  Split numeric variables with integer values into new smaller numeric variables

   net install nsplit , from(http://fauculty.fuqua.duke.edu/home/blanc004/sas_to_stata/) replace

Programmer:  Dan Blanchette ()
Center for Entrepreneurship and Innovation
Duke University's Fuqua School of Business
Durham, NC  USA
Developed at The Carolina Population Center at The University of North Carolina at Chapel Hill
Date:  30Nov2004
Last updated:  02Dec2004

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Split numeric variables with integer values into new smaller numeric variables.

nsplit [varname] [if exp] [in range] , digits(digit pattern in existing variable) [generate(newvarlist or stub)]

nsplit creates however many new numeric variables it takes to split a numeric variable into digit pattern.  If your existing numeric variable contains decimal values, then nsplit will only split the integer portion of the number.

digits(digit pattern in existing variable) describes the pattern in the existing numeric variable.  If it is a repeated pattern then you only need to supply the number of digits the new variables should contain.  For example:

    . nsplit id, digits(2)

for an ID variable with 6 digits is equivalent to:

    . nsplit id, digits(2 2 2)

generate(newvarlist or stub) states what you want the new variable names to be.  If only one name is listed than that will be the first characters of the new variable names:  stub1 stub2 etc.  If no new variable name is en the original variable name will be used as the stub.

 . nsplit id, digits(2 3)

 . list id*

 . nsplit date, digits(2) generate(month year)

 . list date month year
  date month year
  1294 12 94
  588 5 88

Many suggestions were implemented that were made by:
Nicholas J. Cox, University of Durham, U.K.

On-line:  split, mod(), int(), dexfcns