Date: Thu, 31 Jan 2008 18:30:56 +0100
Reply-To: Marta García-Granero <mgarciagranero@gmail.com>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Marta García-Granero <mgarciagranero@gmail.com>
Subject: Re: Means, averages
In-Reply-To: <200801311027.m0VARvNO012670@linhost2.utic.net.ba>
Content-Type: text/plain; charset=ISO-8859-2; format=flowed
Hi Samir
Use ONEWAY with a linear contrast:
DATA LIST LIST/Q G (2 F8).
BEGIN DATA
1 1
3 1
5 1
3 1
3 1
1 2
3 2
4 2
5 2
4 2
5 3
1 3
4 3
4 3
5 4
4 4
2 4
2 4
2 4
END DATA.
ONEWAY Q BY G
/CONTRAST= -3 1 1 1
/STATISTICS DESCRIPTIVES.
This will gice you the correct significance test for the comparison of
group #1 vs average of the other 3. This approach has also the advantage
that you can compare 1st group against a weighted average of the other 3
(provided you have a set of weights to quantify the relative
contribution of each group to the overall mean).
HTH,
Marta García-Granero
> Hi to all,
>
>
>
> I have question about average values. I have data that looks like this:
>
>
>
> These are answers on scale from 1-agree to 5-disagree to certain question. Variables V1, V2, V3, V4
> are basically different groups of respondents but all answers are to the same question. It is the
> same as this one:
>
>
>
> Q G
> 1 1
> 3 1
> 5 1
> 3 1
> 3 1
> 1 2
> 3 2
> 4 2
> 5 2
> 4 2
> 5 3
> 1 3
> 4 3
> 4 3
> 5 4
> 4 4
> 2 4
> 2 4
> 2 4
>
> Q stands for question and G stands for Group.
>
>
> so now I need to compare means in following way: Group1 vs. average of all other groups. How should
> I calculate the average of all other groups? Is it simple as making them all Group2 or should I pay
> attention to some other details?
>
>
>
> Hope I wrote it clear enough:)
>
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