var_names

The function assumes that <code>x</code> is a vector of predicate names, i.e., a character
vector with elements compatible with pattern <code>&lt;varname&gt;=&lt;value&gt;</code>. The function
returns the <code>&lt;varname&gt;</code> part of these elements. If the string does not
correspond to the pattern <code>&lt;varname&gt;=&lt;value&gt;</code>, i.e., if the equal sign (<code>=</code>)
is missing in the string, the whole string is returned.

Extensible framework for
subgroup discovery (Atzmueller (2015) <doi:10.1002/widm.1144>),
contrast patterns (Chen (2022) <doi:10.48550/arXiv.2209.13556>),
emerging patterns (Dong (1999) <doi:10.1145/312129.312191>),
association rules (Agrawal (1994) <https://www.vldb.org/conf/1994/P487.PDF>) and
conditional correlations (Hájek (1978) <doi:10.1007/978-3-642-66943-9>).
Both crisp (Boolean, binary) and fuzzy data are supported.
It generates conditions in the form of elementary conjunctions, evaluates
them on a dataset and checks the induced sub-data for interesting statistical
properties. A user-defined function may be defined to evaluate on each generated
condition to search for custom patterns.

Michal Burda

nuggets

Extensible Data Pattern Searching Framework

var_names function

<dl><dt>x</dt>
<dd>A character vector of predicate names.</dd></dl>

var_names: Extract variable names from predicates

Description

Usage

Value

Arguments

Author

Examples