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Have you thought about opening an Interactive Brokers paper trading account? They keep track of the total return, though their reporting can be trickier to use than it should be. It's also a very good simulation of what investment professionals use, since it's what investment professionals use. If you want to teach investment, I believe Equities Lab might ...


The simple answer is that when you calculate the value weighted return at time $t$ all you really need is the return during time $t$ and the market-capitalization weight as of $t-1$. You can filter the securities to remove the missing ones (and others that you may remove for other reasons, e.g. too small or price too low), calculate weights based on the ...

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