Recent Fuzzy Generalisations of Rough Sets Theory: A Systematic Review and Methodological Critique of the Literature

Table 1

Classification of papers based on application area.

Application areas	Frequency	Percentage of frequency
Information systems	12	9.09%
Decision-making	9	8.33%
Approximation operators	15	11.36%
Feature and attribute selection	24	20.45%
Fuzzy set theories	37	27.27%
Other application areas	35	23.48%
Total	132	100.00