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From |
Maarten Buis <maartenlbuis@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Questions for random data generation and value label |

Date |
Tue, 12 Mar 2013 18:04:00 +0100 |

On Tue, Mar 12, 2013 at 5:33 PM, Yu Xue <snowrain@gmail.com> wrote: > Thanks everyone for answering my question, especially Joseph! I think > you offered a right solution to my problem, although the result is > still not accurate. What do you mean with "not accurate"? I suspect it is accurate in the sense that it does what it promisses to do, except that you wanted it to do something different. So in order to answer your question we need to know _exactly_ what you want. This leads (again) to the question: What is the distribution from which you want to draw your samples? In order to draw a random sample you first need to define a distribution from which to draw that sample. There is no other way and there can be no other way. For example Joseph's solution does that by specifying some transformation of a normal distribution. A mean, standard deviation and a range on its own does not give you enough information to define a distribution from which to draw a random sample. In fact, specifying both the range and the standard deviation will often makes things harder (impossible). For some reason you are not willing to tell us what distribution you want to use. One very reasoable response to that would be: "OK, if you don't want to give the information necessary for us to answer your question, than it's your problem. Good luck." However, lets give it one more try. Maybe if you can tell us exactly what you mean with "not accurate" we can deduce from that what it is that you want to achieve. So tell us _exactly_ what you told Stata to do in order to determine whether or not your result was "accurate", what Stata told you in return, and why you think that those results indicate that the sample is not accurate. -- Maarten --------------------------------- Maarten L. Buis WZB Reichpietschufer 50 10785 Berlin Germany http://www.maartenbuis.nl --------------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Questions for random data generation and value label***From:*Yu Xue <snowrain@gmail.com>

**References**:**st: Questions for random data generation and value label***From:*Yu Xue <snowrain@gmail.com>

**Re: st: Questions for random data generation and value label***From:*Maarten Buis <maartenlbuis@gmail.com>

**Re: st: Questions for random data generation and value label***From:*Yu Xue <snowrain@gmail.com>

**Re: st: Questions for random data generation and value label***From:*Maarten Buis <maartenlbuis@gmail.com>

**Re: st: Questions for random data generation and value label***From:*Yu Xue <snowrain@gmail.com>

**Re: st: Questions for random data generation and value label***From:*Joerg Luedicke <joerg.luedicke@gmail.com>

**Re: st: Questions for random data generation and value label***From:*Yu Xue <snowrain@gmail.com>

**Re: st: Questions for random data generation and value label***From:*"Joseph Coveney" <stajc2@gmail.com>

**Re: st: Questions for random data generation and value label***From:*Yu Xue <snowrain@gmail.com>

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