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st: Re: questions about xtprobit


From   [email protected]
To   [email protected]
Subject   st: Re: questions about xtprobit
Date   Mon, 01 Jan 2007 17:34:05 +0100

I think you can use dummies for years. But why not using -xtlogit, fe- with a time variable indicating the calendar year?
Nicola
At 02.33 30/12/2006 -0500, you wrote:
>ate: Fri, 29 Dec 2006 12:41:09 -0500
>From: David Jacobs <[email protected]>
>Subject: Re: st: questions about xtprobit
>
>What if one wants to control for time in a fixed-effects logit 
>analysis?  Suppose I have pooled time series with panels by year and 
>I want to estimate using a two-way fixed-effects design.  I 
>understand that it is incorrect to use dummies for cases, but is it 
>incorrect to enter separate dummies for each year in fixed-effects 
>logit models?
>
>Dave Jacobs
>
>At 06:11 AM 12/29/2006, you wrote:
>>Not sure if -xtprobit- is the best choice, (I'm not an expert, but 
>>it sounds that the choice depends on what "after a certain event" 
>>means, i.e. are all observations subject to the same event at the same time?).
>>Turning to technical questions on Stata, to my best knowledge you 
>>cannot have fixed effects for -xtprobit-. But you can use 
>>CONDITIONAL fixed effects for -xtlogit-. Remember that you cannot 
>>use dummies to estimate logistic fixed effects (Hsiao 1986). You can 
>>have exponentiated coefficients (odds ratio indicating the 
>>percentage change in the probability of the outcome (the dependent 
>>variable = 1) given a one unit change in the independent variable) 
>>with option -or-.
>>Nicola
>>
>>At 02.33 24/12/2006 -0500, you wrote:
>> >Hi all,
>> >
>> >For my nmaster degree thesis, I have data on firms borrowing from many
>> >sources as shown below. I am trying to run probit model to see how
>> >likely it is that firm will have better access to finance (to
>> >different sources e.g. banks, bond market) after a certain event. With
>> >the data structure below, I want to control for firm's characteristic
>> >too.
>> >
>> >firmid financesource    improveaccesstoloan          x1
>> >1            1                         1                               8
>> >1            2                         0                               8
>> >1            3                         1                               8
>> >
>> >where x1 = indepedent variable capturing firm characteristics for each
>> >firm.
>> >I am thinking about using xtprobit for the following model:
>> >
>> >prob of improving access = financesourcedummies + x1+ x2+.....
>> >
>> >Is xtprobit the right command to use?
>> >Can I use fixed effects with xtprobit?
>> >I tried it and getting coefficient greater than 1. how do I obtain the
>> >correct marginal effects on probability? 

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