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Make subset expression for a split-value pair

Source: R/make_subset_expr.R
make_subset_expr.Rd

Make subset expression for a split-value pair

Usage 

make_subset_expr(spl, val)

# S4 method for class 'VarLevelSplit'
make_subset_expr(spl, val)

# S4 method for class 'MultiVarSplit'
make_subset_expr(spl, val)

# S4 method for class 'AnalyzeVarSplit'
make_subset_expr(spl, val)

# S4 method for class 'AnalyzeColVarSplit'
make_subset_expr(spl, val)

# S4 method for class 'VarStaticCutSplit'
make_subset_expr(spl, val)

# S4 method for class 'CumulativeCutSplit'
make_subset_expr(spl, val)

# S4 method for class 'AllSplit'
make_subset_expr(spl, val)

# S4 method for class 'expression'
make_subset_expr(spl, val)

# S4 method for class 'character'
make_subset_expr(spl, val)

Arguments

spl

(Split)
A split object.

val

(SplitValue or string)
The value, either as a SplitValue object or the raw value as a string.

Value

A subseting expression to be used to restrict data to a particular column during tabulation.

Details

If val is a SplitValue object which already contains a subsetting expression with length >0, that is immediately returned. Otherwise, the appropriate subsetting expression is constructed based on the split type of spl and the value val.

Note

this is occasionally useful when constructing custom splitting behavior which may used for column splitting but generally should not be called directly by the end user.

Examples 


spl <- VarLevelSplit("ARM", split_label = "ARM")
make_subset_expr(spl, "B: Placebo")
#> expression((!is.na(ARM) & ARM %in% "B: Placebo"))