[R] Differences in estimates calculated in R and SPSS

[Charles C. Berry]

As Dirk said:

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On Sat, 14 Oct 2006, Katja Walentowitz wrote:

> 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 at 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
>>
>
> 	[[alternative HTML version deleted]]
>
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Charles C. Berry                        (858) 534-2098
                                          Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	         UC San Diego
http://biostat.ucsd.edu/~cberry/         La Jolla, San Diego 92093-0717