I have a portfolio of 10 of my favourite stocks: Apple, Bank of America, Boeng, Coca Cola, Disney, Exxon Mobile, IBM, J & J, Nike and Walmart. Equally weighted.
I have download data for the time span “1981-01” until “2019-12”.
I would love to calculate the simple portfolio returns
on a monthly basis. And then I am curious how to determine the standard deviation of its return over the entire sample period.
Do anyone have some suggestions how I should start?