Oh, I meant to reply to an older post, but that didn't work
apparently. Below the original post.
This person does a group analysis, with gender and age as
covariates.You adviced to first do a DODS and look for a age-by-group
interaction. If there's no interaction, he/she could continue with
DOSS.
what post? Can you include it in the email so that I know what you are
referring to?
doug
On 9/23/13 7:06 AM, Anita van Loenhoud wrote:
> Hi, I have a question related to this post. Besides an age-group
> interaction, wouldn't it also be neccesary to check for an age-gender
> interaction?
>
Hi, I have a question related to this post. Besides an age-group
interaction, wouldn't it also be neccesary to check for an age-gender
interaction?
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Yes, that looks fine. The only other thing to decide is whether to use
DODS (different offset different slope) or DOSS (different offset same
slope). The default is DODS, but if you don't think that there is an
age-by-group interaction, then you can get more power using DOSS. If you
use DODS,
Hi,
We are doing a group analysis using qdec with two groups, and we would like
to include gender and age as covariates.
Which is the best option in order to perform a simple t-test (group1>group2
and group2>group1) and including the two covariates? (we would like them to
have 'zero' weighting in
