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From | "Marc Michelsen" <marcmichelsen@t-online.de> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | AW: st: Nested Logit Model |
Date | Thu, 15 Jul 2010 17:53:19 +0200 |
Anders, thanks for your comments. Of course I have first used -nlogitgen- and -nlogitree- to set up the nested structure of my panel data. Please see below for more details: . nlogitgen issuetype = mode(NonIssuer: NoIssue , Issuer: Debt | Equity) . nlogittree mode issuetype, choice(d) tree structure specified for the nested logit model issuetype N mode N k ----------------------------------------- NonIssuer 29458 --- NoIssue 29458 21695 Issuer 58916 --- Debt 29458 6109 +- Equity 29458 1654 ----------------------------------------- total 88374 29458 k = number of times alternative is chosen N = number of observations at each level . nlogit d a || issuetype: StandMBRatio BLeverage OpPerformance Size RDExpense RDExpenseDummy Tangibility posoutl negoutl, base(NonIssuer) || mode: StandMBRatio BLeverage OpPerformance Size RDExpense RDExpenseDummy Tangibility posoutl negoutl, base(Debt) case(No) notree nolog Error Message <variables "StandMBRatio BLeverage OpPerformance Size RDExpense RDExpenseDummy Tangibility posoutl negoutl " are specified in more than one equation; this is not allowed> Does this help to clarify the problem? Regards Marc -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Anders Alexandersson Gesendet: Donnerstag, 15. Juli 2010 17:30 An: statalist@hsphsun2.harvard.edu Betreff: Re: st: Nested Logit Model Marc, try -nlogitgen- and -nlogittree- before running -nlogit-, as in the helpfile. Please provide what you typed instead of schematic syntax like "[explanatory variables]", e.g., what is your "altvar"? Anders Alexandersson andersalex@gmail.com On Thu, Jul 15, 2010 at 10:22 AM, Marc Michelsen <marcmichelsen@t-online.de> wrote: > I am trying to run a nested logit model comparable to Huang/Ritter (2009) > "Testing Theories of Capital Structure and > Estimating the Speed of Adjustment", p. 253: > 2-layered Security Issuance Decision: Limbs: NoIssue vs. Issue / Branches > for "Issue": Debt Issuance vs. Equity Issuance. > > Similar to the above mentioned study, I have the same explanatory variables > for the first decision layer (Issue vs. NoIssue) and the second layer (Debt > vs. Equity). Apparently, this is not valid for Stata as I get the following > error message: > <"variables ".." are specified in more than one equation; this is not > allowed> > > My command looks the following: > . nlogit d a || issuetype: [explanatory variables], base(NonIssuer) || > issuetype2: [explanatory variables], base(NoIssue) case(No) notree nolog > > What is wrong with my model specification/general approach? * * 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/