Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: AW: Sample size
From
Fabio Zona <[email protected]>
To
[email protected]
Subject
Re: st: AW: Sample size
Date
Sat, 15 May 2010 16:34:29 +0200 (CEST)
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" <[email protected]>
A: [email protected]
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: [email protected] [mailto:[email protected]] Im Auftrag von Fabio Zona
Gesendet: Samstag, 15. Mai 2010 16:12
An: [email protected]
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 80024610158.
Please note that the above message is addressed only to individuals
filing Italian income tax returns.
---
*
* 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/
---
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 80024610158.
Please note that the above message is addressed only to individuals
filing Italian income tax returns.
---
*
* 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/