• 제목/요약/키워드: statistics based method

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Effects of a GAISE-based teaching method on students' learning in introductory statistics

  • Erhardt, Erik Barry;Lim, Woong
    • Communications for Statistical Applications and Methods
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    • 제27권3호
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    • pp.269-284
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    • 2020
  • This study compares two teaching methods in an introductory statistics course at a large state university. The first method is the traditional lecture-based approach. The second method implements a flipped classroom that incorporates the recommendations of the American Statistical Association's Guidelines for Assessment and Instruction in Statistics Education (GAISE) College Report. We compare these two methods, based on student performance, illustrate the procedures of the flipped pedagogy, and discuss the impact of aligning our course to current guidelines for teaching statistics at the college level. Results show that students in the flipped class performed better than students in traditional delivery. Student questionnaire responses also indicate that students in flipped delivery aligned with the GAISE recommendations have built a productive mindset in statistics.

웹 기반 자료수집 프로그램을 활용한 실제 문제중심의 통계교육 수업방안 (A Real Problem-based Teaching Method in Statistics Education with a Web-based Data Collection Program)

  • 한범수;한경수;안정용
    • 한국학교수학회논문집
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    • 제8권2호
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    • pp.167-181
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    • 2005
  • 통계학을 좀 더 쉽게 이해하며 흥미를 가지고 접근할 수 있도록 하기 위해 다양한 통계교육 방법의 연구가 계속되어지고 있다. 그러나 동계교육에 있어서 항상 겪는 어려운 점 중의 하나는 학생들이 쉽게 받아들일 수 있는 실제 자료가 많지 않다는 것이다. 이는 학생들에게 통계학을 현실과 전혀 관계없는 학문으로 인식시키며 학습 의욕을 저하시키고 통계학을 재미없는 학문으로 인식하게 되는 부정적 결과를 낳게 하였다. 본 연구에서는 웹과 데이터베이스를 활용한 자료 수집 및 공유 프로그램을 활용하여 수업에서 현실감 있고 학생들과 관련이 높은 자료를 활용할 수 있도록 하고 엑셀을 활용하여 학생들이 통계학의 개념과 응용에 더 집중할 수 있는 통계교육 수업방안을 제안한다.

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Estimation of Density via Local Polynomial Tegression

  • Park, B. U.;Kim, W. C.;J. Huh;J. W. Jeon
    • Journal of the Korean Statistical Society
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    • 제27권1호
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    • pp.91-100
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    • 1998
  • A method of estimating probability density using regression tools is presented here. It is based on equal-length binning and locally weighted approximate likelihood for bin counts. The method is particularly useful for densities with bounded supports, where it automatically corrects edge effects without using boundary kernels.

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Circular Statistics in Musicology

  • Lee, Jeong-Ran;Oh, Hee-Seok
    • Communications for Statistical Applications and Methods
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    • 제15권2호
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    • pp.273-282
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    • 2008
  • An essential aspect of music is structure. Beran (2004) introduced a method of comparing piano plays via circular statistics based on the fact that there is circular structure in music. We expand the application of this method to a pair of two pop songs and discuss the possibility of applying it to detecting musical plagiarism. Circular statistics provides an objective view point comparing the musical works.

Adaptive M-estimation using Selector Statistics in Location Model

  • Han, Sang-Moon
    • Communications for Statistical Applications and Methods
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    • 제9권2호
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    • pp.325-335
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    • 2002
  • In this paper we introduce some adaptive M-estimators using selector statistics to estimate the center of symmetric and continuous underlying distributions. This selector statistics is based on the idea of Hogg(1983) and Hogg et. al. (1988) who used averages of some order statistics to discriminate underlying distributions. In this paper, we use the functions of sample quantiles as selector statistics and determine the suitable quantile points based on maximizing the distance index to discriminate distributions under consideration. In Monte Carlo study, this robust estimation method works pretty good in wide range of underlying distributions.

고차 통계를 이용한 잡음 환경에서의 화자식별 (Speaker Identification Using Higher-Order Statistics In Noisy Environment)

  • 신태영;김기성;권영욱;김형순
    • 한국음향학회지
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    • 제16권6호
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    • pp.25-35
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    • 1997
  • 음성 신호 처리에 널리사용되어 온 2차 통계에 의한 음성 분석 방법은 잡음 환경에서 성능이 크게 저하되는 단점을 지닌다. 이에 반하여 고차 통계 방법은 Gaussian 잡음 등을 억제하는 특성을 가지고 있어서 잡음 환경에 상대적으로 강인한 음성 특징 추출을 가능하게 한다. 본 논문에서는 고차 통계에 의한 음성 분석 방법을 이용하여 백색 및 유색 잡음 환경에서의 문맥 독립형(text-independent) 화자식별 시스템을 제안하고, 기존의 2차 통계에 의한 방식과 성능을 비교하였다. 본 논문에서의 화자식별 시스템은 벡터 양자화 방법에 기반을 두고 있으며, 고차 통계 방법에 의한 유성음/무성음 판별을 통해 non-Gaussian 특징을 가지면서도 화자 정보가 집중되어 있는 유성음 부분에 대해서만 음성 특징을 추출하여 인식에 사용하였다. 50명의 화자를 대상으로 한 화자식별 실험 결과, 고차 통계 방법이 2차 통계에 의한 방법보다 잡음 환경에서 상대적으로 우수한 인식 성능을 나타냄을 확인하였다.

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수입관리에서 회귀모형 기반 수요 복원 방법 (A Regression based Unconstraining Demand Method in Revenue Management)

  • 이재준;이우주;김정환
    • 응용통계연구
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    • 제28권3호
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    • pp.467-475
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    • 2015
  • 정확한 수요예측은 수입관리(RM)에서 중요한 요소이다. 기 출발편 예약 데이터는 미래 출발편의 수요를 예측하는데 이용되는데, 이 중 일부 데이터에는 예약 요청이 거부된 경우가 포함된다. 거부된 예약 요청은 통계학적 관점에서 중도절단된 것으로 해석될 수 있으며, 이러한 중도절단된 수요를 복원하는 것은 미래 출발편의 참수요 예측을 위해 중요한 사안이다. 현재까지 여러 복원방법들이 소개되었으며, Expectation Maximization 방법이 가장 우수하다고 알려져있다. 본 연구에서는 중도절단된 자료를 복원할 수 있는 회귀모형 기반의 새로운 수요복원 방법을 제시하였다. 그리고 모의실험을 통해 제안된 새로운 방법의 성능을 RM에서 대표적으로 사용되는 두 가지 복원방법들과 비교하였다.

Estimating quantiles of extreme wind speed using generalized extreme value distribution fitted based on the order statistics

  • Liu, Y.X.;Hong, H.P.
    • Wind and Structures
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    • 제34권6호
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    • pp.469-482
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    • 2022
  • The generalized extreme value distribution (GEVD) is frequently used to fit the block maximum of environmental parameters such as the annual maximum wind speed. There are several methods for estimating the parameters of the GEV distribution, including the least-squares method (LSM). However, the application of the LSM with the expected order statistics has not been reported. This study fills this gap by proposing a fitting method based on the expected order statistics. The study also proposes a plotting position to approximate the expected order statistics; the proposed plotting position depends on the distribution shape parameter. The use of this approximation for distribution fitting is carried out. Simulation analysis results indicate that the developed fitting procedure based on the expected order statistics or its approximation for GEVD is effective for estimating the distribution parameters and quantiles. The values of the probability plotting correlation coefficient that may be used to test the distributional hypothesis are calculated and presented. The developed fitting method is applied to extreme thunderstorm and non-thunderstorm winds for several major cities in Canada. Also, the implication of using the GEVD and Gumbel distribution to model the extreme wind speed on the structural reliability is presented and elaborated.

Convergence rate of a test statistics observed by the longitudinal data with long memory

  • Kim, Yoon Tae;Park, Hyun Suk
    • Communications for Statistical Applications and Methods
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    • 제24권5호
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    • pp.481-492
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    • 2017
  • This paper investigates a convergence rate of a test statistics given by two scale sampling method based on $A\ddot{i}t$-Sahalia and Jacod (Annals of Statistics, 37, 184-222, 2009). This statistics tests for longitudinal data having the existence of long memory dependence driven by fractional Brownian motion with Hurst parameter $H{\in}(1/2,\;1)$. We obtain an upper bound in the Kolmogorov distance for normal approximation of this test statistic. As a main tool for our works, the recent results in Nourdin and Peccati (Probability Theory and Related Fields, 145, 75-118, 2009; Annals of Probability, 37, 2231-2261, 2009) will be used. These results are obtained by employing techniques based on the combination between Malliavin calculus and Stein's method for normal approximation.

Spatial-Temporal Modelling of Road Traffic Data in Seoul City

  • 이상열;안수한;박창이;전종우
    • Journal of the Korean Data and Information Science Society
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    • 제13권2호
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    • pp.261-270
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    • 2002
  • Recently, the demand of the Intelligent Transportation System(ITS) has been increased to a large extent, and a real-time traffic information service based on the internet system became very important. When ITS companies carry out real-time traffic services, they find some traffic data missing, and use the conventional method of reconstructing missing values by calculating average time trend. However, the method is found unsatisfactory, so that we develop a new method based the spatial and spatial-temporal models. A cross-validation technique shows that the spatial-temporal model outperforms the others.

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