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From |
wgould@stata.com (William Gould, StataCorp LP) |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Data Corruption? |

Date |
Thu, 25 Oct 2007 11:28:57 -0500 |

Yesterday Ed Blackburne <blackburne@shsu.edu> reported some odd results that suggested data corruption in Stata. That problem is resolved. The data were not corrupted. The point of this posting is not to embarrass Ed, but to reassure anyone who was worried. It was human error, but certainly an unexpected one. The problem was that Ed was using labels, so the listed data looked different from how they actually were. Here's the idea: Say I have the following dataset: . list +---+ | a | |---| 1. | 1 | 2. | 2 | +---+ Now say I do the following: . label define mylab 1 1000 2 2000 . label values a mylab With that done, here is what I see whan I list the data: . list +------+ | a | |------| 1. | 1000 | 2. | 2000 | +------+ So now I type . gen new = a*10 . list +------------+ | a new | |------------| 1. | 1000 10 | 2. | 2000 20 | +------------+ and it looks to me as if Stata is broken or the data are corrupted or, at the very least, as if Stata doesn't know how to multiply. I don't know the exact details in Ed's case, but I gather than Ed infile'd his data using the automatic label generation option, and so the looked fine to him, but it fact contained 1, 2, ... -- Bill wgould@stata.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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