Newer Symbols have NaN values before Listing date #37
Description
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