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From |
Carlo Amenta <carlo.amenta@gmail.com> |

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

Subject |
R: Re: st: AW: Sample size |

Date |
Sat, 15 May 2010 20:59:09 +0200 |

54 seems to me an adequate size for inferential statistics. What you 'infere' from that reduced sample in term of results to attribute to the population maybe it's the main problem with your analysis. Carlo amenta ----- Messaggio originale ----- Da: Fabio Zona <fabio.zona@unibocconi.it> Inviato: sabato 15 maggio 2010 16.34 A: statalist@hsphsun2.harvard.edu Oggetto: Re: st: AW: Sample size I have a full model, control and 3 indep Var1 Var2 Var3. I have two subgroups, identified by a dummy D When D = 1, the subgroup has only 54 companies (for D=0 I have 139 companies, for a total of 193 companies). I run interactions: Var1 x D Var2 x D Var3 x D I introduce these interactions one per time; afterward, I include them all-together (i.e., a chow test). How can I be sure if my analysis is OK, given that the second subsample has only 54 corporations? ----- Messaggio originale ----- Da: "Martin Weiss" <martin.weiss1@gmx.de> A: statalist@hsphsun2.harvard.edu Inviato: Sabato, 15 maggio 2010 16:19:51 GMT +01:00 Amsterdam/Berlino/Berna/Roma/Stoccolma/Vienna Oggetto: st: AW: Sample size <> " How can I figure out the minimum sample size per each subgroup required to run correct regression (OLS)?" How is a "correct regression" defined theoretically? Stata does have commands like -h sampsi-, but apparently you are looking for something else? HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Fabio Zona Gesendet: Samstag, 15. Mai 2010 16:12 An: statalist@hsphsun2.harvard.edu Betreff: st: Sample size Dear Statalist I have a sample of about 193 corporations; this sample is composed by: - a subgroup of 139 corporations (subgroup A) - a subgroup of 54 corporations (subgroup B), identified by a dummy SUBG I run interactions (i.e., the dummy SUBG x indep var); I also run a chow test. Do you think that 54 companies in the interacting subsample are not enough? How can I figure out the minimum sample size per each subgroup required to run correct regression (OLS)? Thank you --- Il messaggio che segue e' inserito automaticamente dal server di posta dell'Universita' Bocconi. Il 5 per mille per gli studenti meritevoli della Bocconi. E' un atto volontario, non costa nulla e non sostituisce l'8 per mille. Scegli Bocconi: codice fiscale 8002461015 [Messaggio originale troncato] * * 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/

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