Hello.
I am trying to generate a variable that is calculated by using a complicated math expression.
More specially, the expression is the following:
My difficulty is, I do not know how to generate this complicated product and summation function within one time-series variable.
Can anyone help me out?
I am trying to generate a variable that is calculated by using a complicated math expression.
More specially, the expression is the following:
My difficulty is, I do not know how to generate this complicated product and summation function within one time-series variable.
Can anyone help me out?
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