FindSubstr {PrInDT}

Check for forbidden split results in trees

Description

Check whether one of the character strings in the vector 'ctestv' appears as a split result in the conditional inference tree 'ct'; ctestv is a vector of character strings of forbidden split results.
Example: ctestv <- rbind('variable1 == {value1, value2}','variable2 <= value3'), where character strings specified in 'value1', 'value2' are not allowed as results of a splitting operation in 'variable 1' in a tree. For restrictions of the type 'variable <= xxx', all split results in a tree are excluded with 'variable <= yyy' and yyy <= xxx.
Trees with split results specified in 'ctestv' are not accepted during optimization.
A concrete example is: 'ctestv <- rbind('ETH == {C2a, C1a}','AGE <= 20')' for variables 'ETH' and 'AGE' and values 'C2a','C1a', and '20';
For an application, please refer to, e.g., the functions PrInDT and PrInDTreg.
If no restrictions exist, the default = NA is used.

Usage

FindSubstr(ct, ctestv)

Arguments

ct

Tree to be checked

ctestv

Vector with character strings of excluded split results

Value

testt

TRUE if any of the split results in 'ctestv' appears in 'ct'; FALSE otherwise