filters.trade: A Filter System for Selecting Trading Instruments
Enables filtering datasets of tradable instruments by prior
specified identifiers which correspond to saved filter expressions. A
filter is a named expression bound to a target dataset, stored once in a
package level registry, and later applied to select trading codes such as
tickers or symbols out of a universe, price or signal dataset. The design
follows the 'filters' package, replacing the clinical study dataset
convention with a trading instrument convention.
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