Calculate misfit or goodness of fit from 2 curves with different array size.

Hello, im currently trying to find the goodness of fit or misfit value between two plots that have different array size. I have:

[observed] = [distance amplitude]; %size 7*2 [calculated] = [xgrid model]; %size 100*2

Then i make plot of them. I got a result like this. My question is, how can i calculate the goodness of fit between the two curves? I have searched on Google but still have no idea about how to get the misfit or goodness of fit of them. Thankyouu.

[Reuben Harman-Mitchell]

Did you ever figure this out?