Hi yes, I need a running sum...for example Pd 0 0.0003 0 0 0 0 0 1.25E-05 4.32E-05 4.32E-05 4.43E-05 4.43E-05 4.43E-05 0.000132 0.000132 0.000132 0.000135 0.000135 0.000134 0.000139 0.000139 0.000139 0.000142 0.000142 0.000142 0.00021 0.00021 0.00021 0.000203 0.000202 0.000202 0.000194 0.000194 0.000194 0.000185 0.000185 0.000185 leaving the first value i need sum from 2nd position to 13 position basically i need sum of 12 months pd. Then I need sum from 3rd position to 14th position then 4th to 15th position likewise till there are less than 12 values left
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