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2012 Sep 17
6
help with calculation from dataframe with multiple entries per sample
...e and store this as a new variable called "Gain2-3". So in my example three values of 0.3,0.1,0.3 would be calculated for my three unique samples and these values would be repeated in the table according to Sample. I am thus expecting: >mydata #after adding new variable   Sample Time MassGain2-3 1      1    1  3.00.3 2      1    2  3.1 0.3 3      1    3  3.4 0.3 4      2    1  4.0 0.1 5      2    2  4.3 0.1 6      2    3  4.4 0.1 7      3    1  3.0 0.3 8      3    2  3.2 0.3 9      3    3  3.5 0.3 Does anyone have any suggestions as to how to do this? I've looked at the various appl...