Check all formulas and implement how to calculate with those DataFrames.
For now I limited calculations with [:3] to the first 3 symbols as those have no NaN values.
Possible solutions:
limit calculations to 1 year into the past
calculate individualy from first price, i.e. dropna()
don't concatenate DataFrames and find another solution
Check all formulas and implement how to calculate with those DataFrames. For now I limited calculations with [:3] to the first 3 symbols as those have no NaN values. Possible solutions: