Derivation of the Critical Minimum Values of the Multiple Correlation Coefficient for Augmenting Hydrologic Samples

수문자료 확충을 위한 다중상관계수의 한계최소치 유도

  • 허준행 (정회원, 연세대학교 공과대학 토목공하고가)
  • Published : 1994.03.01

Abstract

The augmenting hydrologic data using a correlation procedue has been used to improve the estimates of the mean and variance at the site of interest with short record when one or more nearby sites with longer records are available. The variance of the unbiased maximum likelihood estimator of ${{\sigma}_v}^2$ derived by Moran based on the multivariate normal distribution is modified into the form of Matalas and jacobs for the bivariate normal distribution to get the critical minimum values of the multiple correlation coefficient which give the improvement for estimation the variance at the site of interest. Those values are tabulated for various lengths of records and the number of sites.

주변 관측지점의 자료가 유용한 경우 관측자료가 짧은 지점의 평균과 분산 추정치를 개선하기 위하여 상관계수를 이용한 수문자료 확충을 이용하여왔다. 본 연구에서는 관측지점의 분산 추정치를 개선하기 위한 다중 상관계수의 한계최소치를 얻기 위하여, 다변량 정규분포에 근거하여 Moran이 유도한 확충자료 분산( ${{\sigma}_v}^2$ )의 불편 최우도추정량의 분산식을 Matalas와 Jacobs가 2변량 정규분포에 근거하여 유도한 식의 형태로 변형하였으며, 다양한 자료수와 지점수에 따라 다중상관계수의 한계최소치를 도표화했다.

Keywords

References

  1. U.S. Geological Survey Prof. Paper v.434-C Use of Correlation to Improve Estimates of the Mean and Variance Fiering,M.B.
  2. Water Resour. Res. v.6 no.6 Reliability of a Variance Estimate Obtained from a Sample Augmented by Multivariate Regression Gilroy,E.J.
  3. U.S. Geological Survey Guideline for Determining Flood Flow Frequency, Bulletin # 17B, Hydrology Sub-committee Interagency Advisory Committee on Water Data
  4. U.S. Geological Survey Prof. Paper v.434-E A Correlation Procedure for Augmenting Hydrologic Data Matalas,N.C.;B.Jacobs
  5. Water Resour. Res. v.10 no.1 On Estimators Obtained from a Sample Augmented by Multiple Regression Moran,M.A.
  6. Natl. Bur. Standards Tech. Report v.1 On the Synthetic Record Problem Rosenblatt,J.R.
  7. Water Resour.Res. v.21 no.5 Minimum Variance Streamflow Record Augmentation Procedures Vogel,R.M.;J.R.Stedinger