Reads a time series from a file and adds the result to an Alphabet of Variables.
Every time series has a time frame/period. This is the distance in time between different records in the series. Consider the following series 1, 2, 3, 4, ..., We start reading the series from 8 (This value is set in the time series file or as a member variable in classes inheriting this interface). We read 4 records long series, which is also defined in the inheritors of this interface. The added variable will have cases: {8, 9, 10, 11}. Implemented in GEP::Core::Float::TimeSeries::InterestRateTimeSeries, and GEP::Core::Float::TimeSeries::NormalTimeSeries.
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