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From |
"Jiang, Tao" <TJiang@air.org> |

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

Subject |
st: RE: Recoding strategy |

Date |
Wed, 3 Jul 2002 15:24:05 -0400 |

xpose the data, for each new var, check if it has any repeated value, if has, then sort it and replace it by _n, then xpose back. Not sure if it is efficient -----Original Message----- From: Nick Winter [mailto:nwinter@policystudies.com] Sent: Wednesday, July 03, 2002 2:58 PM To: statalist@hsphsun2.harvard.edu Subject: Recoding strategy Hi- Any thoughts on efficient ways to accomplish the following recoding task? I've got six variables, wherein respondents ranked the importance of each of six strategies. For the vast majority of cases, respondents assigned one rank of "1", one of "2" and so on. Some respondents, however, ranked more than one strategy with the same rank. This takes many forms: some gave two ranks of "1", then one of "3", "4", "5", and "6". Others gave two ranks of "1", then one of "2" through "5" but no "6". Others gave more than two of the same rank to different items, etc. We want to do the following to produce a fully consistent set of rankings: For multiple identical rankings, randomly order them, and then rank subsequent ranks sequentially from there. So, for example, if the data look like this for two cases: S1 S2 S3 S4 S5 S6 1 1 2 3 4 5 3 1 1 4 5 6 I would want to change it to: S1 S2 S3 S4 S5 S6 1 2 3 4 5 6 3 1 2 4 5 6 That is, for the first case, S1 was randomly chosen to be kept as one and S2 as two; and the remaining ranks ordered from there. Similarly for the second case. Any thoughts? I should say, in closing, that I did not decide on this approach, so while I would certainly enjoy any commentary on why it's a bad idea, I will need to implement it regardless... Thanks Nick W. ----------------------------------------------------------- Nicholas Winter, Ph.D. P 202.939.5343 Policy Studies Associates F 202.939.5732 1718 Connecticut Avenue, NW nwinter@policystudies.com Washington, DC 20009-1148 www.policystudies.com ----------------------------------------------------------- * * 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/

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