Question: Step 9 ( 1 0 pts ) . Calculate sum of log returns by quarter from the groups at Step 8 by using the sum

Step 9(10 pts). Calculate sum of log returns by quarter from the groups at Step 8 by using the sum method of pandas DataFrame, and assign it to self._logret_quarter.
Step 9 ( 1 0 pts ) . Calculate sum of log returns

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