DOI QR코드

DOI QR Code

경험적 영향함수와 표본영향함수 간 차이 보정의 t통계량으로의 확장

Extending the calibration between empirical influence function and sample influence function to t-statistic

  • 투고 : 2021.02.27
  • 심사 : 2021.08.30
  • 발행 : 2021.12.31

초록

본 연구는 Kang과 Kim (2020)의 후속 연구이다. 본 연구에서는 기존 연구에서 직접 유도하지 않았던 통계량의 표본영향함수를 유도한다. 그리고 이 결과를 바탕으로 경험적 영향함수와 표본영향함수는 어떠한 관계를 가지고 있는지 이론적으로 살펴보고, 경험적 영향함수를 통해 표본영향함수를 근사시켜 추정하는 방안에 대해 생각해 본다. 또한, 임의추출한 300개의 데이터를 바탕으로 모의실험을 통해 유도한 함수와 그 관계에 대한 그 타당성도 검증한다. 모의실험 결과 t통계량으로부터 유도한 표본영향함수와 경험적 영향함수와의 관계 및 경험적 영향함수를 통한 표본영향함수의 근사 방안에 대한 타당성도 검증해 냈다. 본 연구는 경험적 영향함수를 이용한 표본영향함수의 근사에서 오차를 줄이기 위한 방안을 제안하고 그 타당성을 검증하였으며, 이를 통해 기존의 연구에서 경험적 영향함수로 표본영향함수를 바로 근사시켰던 연구 방법에 효과적인 근사 방안을 제안한 점에서 의의를 갖는다.

This study is a follow-up study of Kang and Kim (2020). In this study, we derive the sample influence functions of the t-statistic which were not directly derived in previous researches. Throughout these results, we both mathematically examine the relationship between the empirical influence function and the sample influence function, and consider a method to approximate the sample influence function by the empirical influence function. Also, the validity of the relationship between an approximated sample influence function and the empirical influence function is verified by a simulation of a random sample of size 300 from normal distribution. As a result of the simulation, the relationship between the sample influence function which is derived from the t-statistic and the empirical influence function, and the method of approximating the sample influence function through the empirical influence function were verified. This research has significance in proposing both a method which reduces errors in approximation of the empirical influence function and an effective and practical method that evolves from previous research which approximates the sample influence function directly through the empirical influence function by constant revision.

키워드

참고문헌

  1. Campbell NA (1978). The influence function as an aid to outlier detection in discrimination analysis, Applied Statistics, 27, 251-258. https://doi.org/10.2307/2347160
  2. Cook RD (1977). Detection of influential observation in linear regression, Technometrics, 19, 15-18. https://doi.org/10.2307/1268249
  3. Cook RD and Weisberg S (1980). Characterization of empirical influence function for detection influential cases in regression, Technometrics, 22.
  4. Cook RD and Weisberg S (1982). Residual and Influence in Regression, Chapman & Hall, New York.
  5. Critchley F (1985). Influence in principal components analysis, Biometika, 72, 627-636. https://doi.org/10.1093/biomet/72.3.627
  6. Hampel FR (1974). The Influence curve and its role in robust estimation, Journal of the American Statistical Association, 69, 383-393. https://doi.org/10.1080/01621459.1974.10482962
  7. Kang H and Kim H (2020). A study on the difference and calibration of empirical influence function and sample influence function, The Korean Journal of Applied Statistics, 33, 527-540. https://doi.org/10.5351/KJAS.2020.33.5.527
  8. Kim H (1992). Measures of influence in correspondence analysis, Journal of Statistical Computation and Simulation, 40, 201-217. https://doi.org/10.1080/00949659208811377
  9. Kim H (1998). A study on cell influence to Chi-square statistic in contingency tables, The Korean Communications in Statistics, 5, 35-42.
  10. Kim H and Lee H (1996). Influence functions on χ2 statistic in contingency tables, The Korean Communications in Statistics, 3, 69-76.
  11. Kim H and Kim K (2005). Influence of an observation on the t-statistic, The Korean Communications in Statistics, 12, 453-462.
  12. Kim S and Kim H (2019). A study on the performance of the influence function on the t-statistic depending on population distributions, Journal of the Korean Data & Information Science Society, 30, 573-585. https://doi.org/10.7465/jkdi.2019.30.3.573
  13. Lee H and Kim H (2003). The changes in statistic when a row is deleted from a contingency table, The Korean Communications in Statistics, 10, 305-317.
  14. Lee H and Kim H (2008). Influence function on the coefficient of variation, Communications for statistical applications and methods, 15, 509-516. https://doi.org/10.5351/CKSS.2008.15.4.509
  15. Park S and Kim H (2019). A study on the location of the observation which has the least effect on the-statistic, Journal of the Korean Data & Information Science Society, 30, 1221-1232 https://doi.org/10.7465/jkdi.2019.30.6.1221
  16. Radhkrishnan R and Kshirsagar AM (1981). Influence functions for certain parameters in multi-variate analysis, Communications in Statistics, 10, 515-529. https://doi.org/10.1080/03610928108828055