Newbie just learning.

Trying to figure out how I generate monthly returns information. I have
daily returns and daily equity for a trading system over a 10 year period in
an xts format. I'd like to collapse the daily data into monthly data. In
addition, I'd like to be able to create a table of monthly returns by year.
I tried table.CalendarReturns() in the PerfomanceAnalytics package but it
seems like it needs monthly returns as the input.

Suggestions ?

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