반복함수 시스템
https://terms.naver.com/entry.nhn?docId=3477843&cid=58439&categoryId=58439
https://en.wikipedia.org/wiki/Iterated_function_system
지프의 법칙
https://ko.wikipedia.org/wiki/%EC%A7%80%ED%94%84%EC%9D%98_%EB%B2%95%EC%B9%99
P값
https://en.wikipedia.org/wiki/P-value
https://terms.naver.com/entry.nhn?docId=20761&cid=43659&categoryId=43659