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From |
"Sayer, Bryan" <BSayer@s-3.com> |

To |
"'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: RE: eliminating the nth digit of a numeric variable |

Date |
Thu, 27 Feb 2003 09:48:50 -0500 |

Or find the maximum value of the numeric variable (so that you know the number of characters), generate a string version, remove the zero, and convert back to a numeric. Say the maximum is 9999999 (seven digits). I don't do this enough in Stata to know the exact commands, but in SAS I would do: newnumvar = input(substr(put(oldnumvar,z7.0),1,4)||substr(put(oldnumvar,z7.0),6,2),f6.0) Which is putting the old numeric variable zero filled to the left in a string format of length 7, concatenating the first 4 characters with the last two, and then inputting the concatenated version into a new numeric variable. As Nick says, this REQUIRES that the unwanted zero appears in the third from the right position. I'm sure the equivalent is possible in Stata, I just don't know how to put a numeric into a string with zero fill. Bryan Sayer Statistician, SSS Inc. bsayer@s-3.com -----Original Message----- From: Nick Cox [mailto:n.j.cox@durham.ac.uk] Sent: Thursday, February 27, 2003 8:11 AM To: statalist@hsphsun2.harvard.edu Subject: st: RE: eliminating the nth digit of a numeric variable Sanz De Galdeano, Anna > > I have a numeric variable which takes, for instance, values like: > > 1017 > 273076 > 518097 > 3046 > > As you see, all these numbers have one thing in common: the > third difit > starting from the right is always 0. That 0 should not be > there and I want > to get rid of it so that my numeric variable looks like: > > 117 > 27376 > 51897 > 346 > > I think I could get what I want by using decode to transfor > my numeric > variable into a string variable and then use some of the > string functions > and/or some of the egen options for strings. > I guess (although I did not work it out) I could also use > an algorithm. But > I have run into similar problems in the past and I would > like to know > whether there is any stata routine that can be used > (something similar to > what the string functions do, but for numeric varriables > instead) to get the > desired result faster. Your last two digits are mod(myvar,100) and the rest of the number is 100 * int(myvar/1000) so everything is 100 * int(myvar/1000) + mod(myvar,100) Another way to do it real(subinstr(string(myvar),"0","",1)) but that assumes that "0" occurs just once. Nick n.j.cox@durham.ac.uk * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**st: RE: RE: RE: eliminating the nth digit of a numeric variable***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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