Thank you in advance for anyone's help. I took stats years ago, and now need to reteach myself for a project.
I have 3 groups with different interventions and measurements yearly over 6 years. I do not have pre-data.
Can I compare to see if there is a statistically significant difference between intervention efficacy?
I'm also thinking of using a Mann-Kendall.
Thank you!
Sorry its probably a basic stats question