한국수학교육학회지시리즈A:수학교육 (The Mathematical Education)
- 제45권3호
- /
- Pages.315-318
- /
- 2006
- /
- 1225-1380(pISSN)
- /
- 2287-9633(eISSN)
제곱합과 교차곱합의 특성을 이용한 표본분산과 상관계수의 계산
Updating Sample Variance and Correlation Using Sum of Squares and Sum of Cross product
-
Cho Tae-Kyoung
(Department of Statistics and Information Science, Dongguk University) ;
- Shin Mi-Young (Department of Mathematics, The Catholic University of Korea)
- 발행 : 2006.08.01
초록
In this paper we present the simple updating formulas for a sum of product and a sum of cross product when a new value is added on or a specific value is eliminated from the original data. The sample variance and correlation for the new data set are derived by new computing formulas. Any statistic which is a function of the sum of product and a sum of cross product also can be updated by proposed method even though the original data is not available.
키워드