Thanks again Marteen. I totally agree with the explanation of the
theoretical concept that must be introduced in my paper.
Anyway in terms of operationalization, I probably wasn't clear in my
first message: 1) I used yearly dummy variables to estimate the model
and I then Test for their equality: isn't it main effects of time
(captured by that dunnies) and no interaction case. ") i agree with
the no main effects.
2008/10/28 Maarten buis <[email protected]>:
> --- Chiara Mussida <[email protected]> wrote:
>> I know that the term homogeneous could be ambiguous. But on the othe
>> other hand, it is difficult to find a way of expressing and testing
>> the overall concept. Anyway, I will state that my test is a simple
>> equality test. But I will try with the interaction between my
>> covariates and time to better verify the behaviour of my
>> probabilities.
>
> In terms of writing up your paper it can help to distinguish between
> the theoretical concept, which can be a bit fuzzy, and the
> operationalization, which has to be exact. In your case you have a
> theoretical concept homegenous over time, and you operationalized it in
> two ways: 1) no interactions and no main effects of time, and 2) no
> main effects of time.
>
> -- Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room N515
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
>
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--
Chiara Mussida
PhD candidate
Doctoral school of Economic Policy
Catholic University, Piacenza (Italy)
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