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From |
Raphael Fraser <raphael.fraser@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: Matching Problem |

Date |
Sun, 17 Oct 2010 12:01:51 -0400 |

Thank you Stefan!! On Sun, Oct 17, 2010 at 11:32 AM, Nick Cox <n.j.cox@durham.ac.uk> wrote: > I support Stefan's approach here. Note that (e.g.) > > gen match = 0 > replace match = 1 if int(test/5) == int(train/5) > > is just > > gen match = int(test/5) == int(train/5) > > However, there is a small problem with either if there are missing values. > > gen match = int(test/5) == int(train/5) if !missing(test, train) > > is better than either. > > Nick > n.j.cox@durham.ac.uk > > Stefan.Gawrich@hlpug.hessen.de > > try this: > > *** Example Dataset > clear > set obs 1000 > gen test = int(uniform()*200) > gen train = int(uniform()*200) > gen match = 0 > > *** You're not clear about start and end of the intervals you want: 1, 6, 11 vs. 70, 125 > *** So choose the command that fits. > > ** Intervals [0..4] [5..9] [10..14]... [195-199] [200] > replace match = 1 if int(test/5) == int(train/5) > > ** Intervals [0] [1..5] [6..10] [11..15]... [196..200] > replace match = 1 if int((test+4)/5) == int((train+4)/5) > > Raphael Fraser > > I have two variables which I will call test and training each > containing integers between 1-200. Each number in the test variable > represents an image. The training variable contains the closest image > to the test image in terms of similarity. > > test = (129, 163, 71, 176, 125, ...) > train = (128, 162, 71, 119, 123, ...) > > The objective is to match both integers to the same interval. These > are the intervals 1-5, 6-10,11-15, ..., 196-200. For example, when > test=129 and train=128 are both in the same interval 125-130. Also > test=71,train=71 are both in the interval 70-75. These are successful > mappings. I would like a successful mapping to be =1 and failure=0. > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Matching Problem***From:*<Stefan.Gawrich@hlpug.hessen.de>

**st: RE: Matching Problem***From:*Nick Cox <n.j.cox@durham.ac.uk>

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