Requests security returns for the given date range and rollingPeriod.

The simple or compound return for the requested frequency and/or rollingPeriod. Depending on the input parameters the return will adjust accordingly. If you simply use frequency and no rollingPeriod, the return value will represent the frequency period. If you use rollingPeriod, the values will be returned in actual period ends (e.g. actual month, actual week, daily, etc.). General Return Calculation Details found on [Online Assistant Page #8748](https://oa.apps.factset.com/pages/8748)