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From |
"Sergio Correia" <sergio.correia@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: sample splitting problem |

Date |
Wed, 21 Nov 2007 01:26:38 -0500 |

Probably the simplest thing is to collapse the dataset and then obtaining the median. Something like this (change the varnames where appropiate): preserve gen ratio = x/y collapse ratio, by(firm) su ratio, detail local threshold = r(p50) restore gen more_x = (x/y > `threshold') In the end, we restore the data and create a dummy variable that indicates whether each firm has more of x or not (not having more of x is the same as having more of y). HTH, Sergio PS: I'm assuming your panel is in -long- format. If not, set it as long. On 21 Nov 2007 06:00:21 -0000, <dist@interfree.it> wrote: > Dear all, here I'm again for a new request of help. I would like to replicate a sample splitting into my research. > Given an unbalanced panel (ts-cs data) and two variables, x and y, the sample splitting criterion is the following: > a firm is identified as having more "x" (high_x) if "x/y" is larger than the median accross firms of the firms' time averages. Conversely, a firm is identified as having less "x" (low_x) if "x/y" is less than (or equal to) the median accross firms of these time averages. I would be grateful if someone can help me with the commands (just an example to use for my dataset). > > Thank you very much. > > > > (I'm sending this message again, since the first one - from another email - never appeared into the list) > > ---------------------------------------------------------------------------- > DEXGATEMICRO il centralino VoIP multifunzione per l'azienda. > Prova gratuita per 4 utenti! > > > Scopri tutte le funzionalita' sul sito Dexgate.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/ > * * 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/

**References**:**st: sample splitting problem***From:*dist@interfree.it

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