1
$\begingroup$

I am analyzing my data of my experiment and I have a question concerning the repeated measures ANOVA. I have 2 independent variables (temperature and salinity), 1 dependent which is length and 2 measuring points (3rd and 7th day) of the experiment.

So my question is, can I use repeated measures ANOVA when I only have 2 time points? I read somewhere that you need more than 3.

In case I can't do it, is it possible to run a 3-way ANOVA and set temperature, salinity and day (3rd and 7th) as a factor?

$\endgroup$
  • $\begingroup$ You can do it with 2 time points. $\endgroup$ – Patrick Coulombe Aug 5 '14 at 0:03
1
$\begingroup$

It is certainly possible with 2 time points. The idea of a repeated measures ANOVA is to compare data within subjects. That is, to compare the data a participant had at T1 versus the data at T2 (and T3 and so on). This is for example before and after an intervention.

In short, yes a repeated measures ANOVA is possible with 2 time points.

A 3-way ANOVA is not the analysis you want, because unlike your variable "day", the variables temperature and salinity are not within-subjects.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.