I have compared the models, they are exactly the same. The same for the
data. The problem occurs most often when I use the aov-function.
When I calculate the fitted values, they are the same, but the intercept is
somewhat different. In R the intercept is more or less the mean of the
regressand values, as defined in some statistical books - but still: it is
not the exact mean. In SPSS it is not.

Thanks again for helping me.
Katja

On 10/14/06, Dirk Eddelbuettel <edd@debian.org> wrote:
>
>
> On 14 October 2006 at 16:59, Katja Walentowitz wrote:
> | I am a bit confused because I get different estimates for the regression
> | coefficients from R and SPSS.
> | Does anyone have an explanation for this?  As I am not so experienced in
> | data analysis, I don't know why this happens.
>
> Maybe you are not estimating the same model -- one may have an intercept,
> and
> the other doesn't.  Or maybe something happens while you read the data --
> start by comparing summary statistics, tabulations and plots of your data.
>
> But as you didn't tell what you estimated, and how, it is a tad hard for
> use
> to guess.  There is a Posting Guide recommending how to phrase questions
> and
> what to suplly ...
>
> Dirk
>
> --
> Hell, there are no rules here - we're trying to accomplish something.
>                                                   -- Thomas A. Edison
>

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