Do you mean a study with small sample sizes?I have this small study, and I am wondering how to analyze it.

How large were your sample sizes, and BTW what is this all about,

what are the topic and the research question of your study?

What did you actually measure, on which scale?I have a measure X taken before some event, and after for every participant (subject).

Were subjects allocated randomly to groups?In addition, I have two groups, "treatment" and "control".

How do you define large/small change? - But apart from that,I want to show, that for the treatment group there is a very small change between the measure after and the measure before, in compare to the control group, in which I expect a much bigger difference.

in a small study, you will be happy if you are able to show at

all whether there is a change or not, regardless of how big or small.

I don't know what you mean by "much lower".I could also show that for the treatment group the values after are much lower than for the control group (will also show the effect I am after).

But if you restrict yourself to the more easy question

whether the change is just different between goups,

this will be much more easy to handle.

If you have an interval scaled measure, and sample sizes

are large enough, then you could consider using repeated

measures (mixed) ANOVA with time as within-subject factor

and group as between-subjects factor.

With kind regards

K.