• Title/Summary/Keyword: 상대표본오차

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A Note on the Decision of Sample Size by Relative Standard Error in Successive Occasions (계속조사에서 상대표준오차를 이용한 표본크기 결정에 관한 고찰)

  • Han, GeunShik;Lee, Gi-Sung
    • The Korean Journal of Applied Statistics
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    • v.28 no.3
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    • pp.477-483
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    • 2015
  • This study deals with the decision problem of sample size by the relative standard error of estimates derived from survey results in successive occasions. The population of the construction in business survey results is used to calculate quartile of the relative standard error of the 1,000 sample obtained from simple or stratified random sampling. The sample size at time t with a relative standard error of the point (t-1) in the successive occasions were calculated according to the sampling method. As a result, in terms of the sample size according to the size of the relative standard error of the (t-1), simple random sampling differs significantly from stratified sampling. In addition, we could see differences in sample size (depending on how the population is stratified) and that careful attention is required in the problem of sample size by the relative standard error of estimates derived from survey results in successive occasions.

A Study on the sampling Design for the Labor Demand Survey (노동력수요동향조사 표본설계에 관한 연구)

  • 김종호;염준근;김명철;정기문;한성실;김은주
    • The Korean Journal of Applied Statistics
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    • v.12 no.2
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    • pp.375-385
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    • 1999
  • 본 연구에서는 노동력수요동향조사를 위한 새로운 표본설계를 제시하였다. 새로운 표본설계에서는 전국 통계를 산출하기 위한 전국표본과 지역 특성에 맞는 고용정책 및 직업 훈련 계획 수립 등을 위한 지역통계의 수요에 따라 16개 시·도별, 규모별, 산업대분류별로 오차를 관리할 수 있는 지역표본으로 이원화하여 설계하였으며, 규모별, 산업대분류별로 오차를 관리하는 현행 표본조사의 상대표준오차를 검토하여 규모별, 산업중분류별로 합리적인 오차 관리가 가능하도록 설계하였다.

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An Application of Sampling to Determine a Proper Rate of Probe Vehicles for Macroscopic Traffic Flow Monitoring Indices (거시교통류 모니터링 지표산출을 위한 적정 프로브차량 비율 결정에 관한 연구)

  • Shim, Jung-Suk;Heo, Hyun-Moo;Eom, Ki-Jong;Lee, Chung-Won;Ahn, Su-Han
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.9 no.2
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    • pp.33-40
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    • 2010
  • In this paper, we consider three macroscopic traffic flow monitoring indices, Travel Time Index(TTI), Acceleration Noise(AN) and Two Fluid(TF) and investigate how to determine a proper rate of probe cars for producing reliable values of these indices. For the analysis, we use classical sampling theories and provide numbers of probe rates using simulation data.

Design-Based Properties of Least Square Estimators of Panel Regression Coefficients Based on Complex Panel Data (복합패널 데이터에 기초한 최소제곱 패널회귀추정량의 설계기반 성질)

  • Kim, Kyu-Seong
    • Communications for Statistical Applications and Methods
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    • v.17 no.4
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    • pp.515-525
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    • 2010
  • We investigated design-based properties of the ordinary least square estimator(OLSE) and the weighted least square estimator(WLSE) in a panel regression model. Given a complex data we derive the magnitude of the design-based bias of two estimators and show that the bias of WLSE is smaller than that of OLSE. We also conducted a simulation study using Korean welfare panel data in order to compare design-based properties of two estimators numerically. In the study we found the followings. First, the relative bias of OLSE is nearly two times larger than that of WLSE and the bias ratio of OLSE is greater than that of WLSE. Also the relative bias of OLSE remains steady but that of WLSE becomes smaller as the sample size increases. Next, both the variance and mean square error(MSE) of two estimators decrease when the sample size increases. Also there is a tendency that the proportion of squared bias in MSE of OLSE increases as the sample size increase, but that of WLSE decreases. Finally, the variance of OLSE is smaller than that of WLSE in almost all cases and the MSE of OLSE is smaller in many cases. However, the number of cases of larger MSE of OLSE increases when the sample size increases.

A sample design for the survey on goodwill in retail properties (상가권리금 현황조사를 위한 표본설계 연구)

  • Kim, Dal Ho;Woo, Namkyo;Jo, Junwoo
    • Journal of the Korean Data and Information Science Society
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    • v.27 no.6
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    • pp.1443-1452
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    • 2016
  • In this paper, we study a sample design for survey on goodwill in retail properties to provide a protecting policy for small traders and tenants, to use basic data for a dispute case related to goodwill. Since goodwill in retail properties is occurred by individual rent company, we use the census on establishments from the Statistics Korea as population. First of all, we consider preferentially seven metropolitan cities in which there are more than half of population. Total sample size is decided as 8,000. We allocate the sample size for markets as stratum in each city using proportional formula and the sample size for industrial classifications in each market using root proportional formula. Also we compute survey weights and calculate estimators, standard errors and interval of estimators for each characteristic such as type of establishments and market in seven metropolitan cities.

Efficient Estimation of Regression Coefficients in Regression Model with Moving Average Process (오차항이 이동평균과정을 따르는 회귀모형에서 회귀계수의 효율적 추정에 관한 연구)

  • 송석현;이종협;김기환
    • The Korean Journal of Applied Statistics
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    • v.12 no.1
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    • pp.109-124
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    • 1999
  • 일반적으로 오차항이 자기상관되어 있는 선형회귀 모형에서는 회귀계수에 대한 보통최소제곱추정량이 효율적이지 못 하다고 알려져 있다. 그러나 이러한 일반화선형회귀모형에서 독립변수의 형태에 따라서는 OLSE의 사용 가능성을 제시하는 모형이 있다. 본 연구에서는 오차항이 일차 이동평균 과정을 따르는 선형회귀모형에서 여러 추정량들 (GLSE, APX, MAPX)에 대한 OLSE의 상대효율함수를 유도하고 비교 분석하고자 한다. 특히 소표본에서 정확한 상대효율값을 구하여 OLSE의 효율성이 크게 떨어지지 않거나 효율성이 나은 회귀모형들을 제시한다.

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Sample size determination using design effect formula for repeated surveys (반복조사에서 설계요소를 반영한 표본수 결정)

  • Park, Inho;Hwang, Hyeon Gil
    • The Korean Journal of Applied Statistics
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    • v.32 no.4
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    • pp.643-652
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    • 2019
  • We propose a method for sample size determination using design effect formulas when a sample is resigned for a repeated survey. The proposed method enables the determination of the sample size by incorporating the impact of various design components to the sampling error through design effect formulas that are applicable under multistage sampling design and stratified multistage sampling designs.

Efficiency of Variance Estimators for Two-stage PPS Systematic Sampling (2단 크기비례 계통추출법의 분산추정량 효율성 비교)

  • Kim, Young-Won;Kim, Yeny;Han, Hye-Eun;Kwak, Eun-Sun
    • The Korean Journal of Applied Statistics
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    • v.26 no.6
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    • pp.1033-1041
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    • 2013
  • In this paper, we investigate several variance estimators for pps systematic sampling. Unfortunately, there is no unbiased variance estimators for a systematic sample because systematic sampling can be regarded as a random selection of one cluster. This study provides guidance on which variance estimator may be more appropriate than others in several circumstances. We judge the efficiency of variance estimators for systematic sampling based on of their relative biases and relative mean square error. Also, we investigate variance estimation problems for two-stage systematic sampling applied for the Food Raw Material Consumption Survey and the Establishment Labor Force Survey simulation study, in order to consider the popular two-stage pps systematic sample design for establishment and household survey in Korea.

Study on the size of experiments in mixed models (혼합모형에서 실험의 크기에 관한 연구)

  • 이연수;임용빈;김재주
    • The Korean Journal of Applied Statistics
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    • v.12 no.2
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    • pp.593-603
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    • 1999
  • 표본의 크기의 제1종오류의 확률 $\alpha$, 실용적으로 차이가 있다고 판독되어서 검출하고자하는 요인효과의 오차에 대한 상대적인 크기, 그 값에서의 제2종오류의 확률 $\beta$에 따라서 결정된다. 이 논문에서, 우리는 고정요인과 랜덤요인이 포함된 실험계획에서 표본의 크기를 결정하는 방법을 간단한 MATLAB 프로그램을 사용하여 고려한다. 분할법과 지분요인배치법의 예제를 들어 유의수준 $\alpha$와 최소 표준과 검출효과 $\Delta^*$에서 검정력이 적어도 $1-\beta$를 갖도록 표본의 크기를 결정한다

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전국 지가변동을 조사를 위한 표본설계 연구

  • 이기재;최엄문;박성현
    • Communications for Statistical Applications and Methods
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    • v.5 no.3
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    • pp.675-684
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    • 1998
  • 지가변동율조사는 전국의 지가변동상황을 조사하여 국가 토지정책 수행을 위한 기초자료로 활용되고 있다. 새로운 표본설계는 지가변동율조사의 부차모집단인 전국 246개 시·군·구 내에서 각 토지의 용도지역 구분과 실제이용상황을 고려하여 층화하였다 또한 각 시 군· 구에서 평균지가지수의 상대표준오차를 일정하게 관리하였고, 각 용도지역별 최소표본수를 배정하여 발표되는 용도지역별 지가지수와 변동율의 신뢰성을 높였다.

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