hi h1 and h2 are index/ i want to group all h1=101 or h2=101 and calculate mx1 mx2 mean so on to h1=175 or h2=175. thanks this is example of my data: h1 mx1 h2 mx2 101 25.2 175 25 175 24 220 22 220 24.7 101 20 101 22 255 15.1 301 25 175 25.2 122 15 101 16
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