I have vegetation index (VI) fitted seasonal curves for two years (beginning and end of time series analyzed), each curve (annual) is formed by twelve points (month, VI):

📷 See attach file

This is for 33 sites in two regions: Norwest whit 17 sites, and Southeast with 16 sites.

How can I contrast the curves whit a single test?

It is feasible the model IV~Region+Site+Time+Month

IV: vegetation index

Region: factor with two levels

Site: factor with 33 levels

Time: factor with two levels

Month: factor with 12 leves

I have only one IV value for each combination

I am interested in the contrast between regions, between zones for each region and between time for each site)

Best Regards.

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