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I want to compare how does a dependent variable (total flow) changes with a covariate (total rain) between two groups (stream A & B). Usually, i would go with ANCOVA. But these groups have the same number of observations. And each observation in A correspond to an observation in B, because they were generated from the same rain event (total rain). Do i:

  1. Do an ANCOVA/multiple-regression
  2. Find the difference between A and B, then regress those values against the covariate?

If method 2 is better, i have tried and got some negative values from A-B. How do i go about it?

I hosted the sample data here

Thank you...

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