# Calculate the total returns from the total return index [closed]

I have the Total Return Index(RI) for several companies.

I know that I can calculate the log retunrs with $ln(RI_t/RI_{t-1})$. Therefore my first guess would be to calculate the total returns like that:

$RI_t/RI_{t-1}$

Is this true?

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## closed as off-topic by Joshua Ulrich, olaker♦Jan 2 at 14:45

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No, it would be $$(RI_{t}-RI_{t-1})/RI_{t-1}$$