extract_selection: Extract inclusion criteria based on selection symbols
In biostatUniBS/RDataXMan: Data Extraction Management

Extract inclusion criteria based on selection symbols

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extract_selection(selection, selection_symbol, key.var)

extract_selection_logic(logic, request, key.var)

`selection`	The column for selection.
`selection_symbol`	Symbol to indicate selection.
`key.var`	The name of variable based on which inclusion criterion is specified. Vector with multiple elements is not allowed. To have complex inclusion criteria based on multiple variables, generate one request form for each variable.
`logic`	The column for logic.
`request`	Data read from request file.