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941.
The Coverage Probability of Confidence Intervals in One‐Way Analysis of Covariance after Two F Tests
Waruni Abeysekera Paul Kabaila Oguzhan Yilmaz 《Australian & New Zealand Journal of Statistics》2013,55(3):221-234
Volume 3 of Analysis of Messy Data by Milliken & Johnson (2002) provides detailed recommendations about sequential model development for the analysis of covariance. In his review of this volume, Koehler (2002) asks whether users should be concerned about the effect of this sequential model development on the coverage probabilities of confidence intervals for comparing treatments. We present a general methodology for the examination of these coverage probabilities in the context of the two‐stage model selection procedure that uses two F tests and is proposed in Chapter 2 of Milliken & Johnson (2002). We apply this methodology to an illustrative example from this volume and show that these coverage probabilities are typically very far below nominal. Our conclusion is that users should be very concerned about the coverage probabilities of confidence intervals for comparing treatments constructed after this two‐stage model selection procedure. 相似文献
942.
Hideo Kozumi 《统计学通讯:模拟与计算》2013,42(4):1361-1375
When the error terms are autocorrelated, the conventional t-tests for individual regression coefficients mislead us to over-rejection of the null hypothesis. We examine, by Monte Carlo experiments, the small sample properties of the unrestricted estimator of ρ and of the estimator of ρ restricted by the null hypothesis. We compare the small sample properties of the Wald, likelihood ratio and Lagrange multiplier test statistics for individual regression coefficients. It is shown that when the null hypothesis is true, the unrestricted estimator of ρ is biased. It is also shown that the Lagrange multiplier test using the maximum likelihood estimator of ρ performs better than the Wald and likelihood ratio tests. 相似文献
943.
李仁和 《长江大学学报(社会科学版)》2001,24(4):122-124
根据中国教学法的沿革及目前中国高校教学现状 ,文章提出了教师引导学生自己思考研究的大学文科教学方法 ;同时 ,还设想了与之配套的多项成绩累积分制的考核方法。 相似文献
944.
对普通话水平测试的复审表明,评分中“朗读”与“说话”的误差较大,其原因涉及试卷构成与队伍建设等多个方面。为提高普通话水平测试的信度,以普通话语音知识和方言学、音位学的基本知识作为内容的测试员后期培训应尽快付诸实施。 相似文献
945.
This article considers the twin problems of testing for autoregressive conditional heteroscedasticity (ARCH) and generalized ARCH disturbances in the linear regression model. A feature of these testing problems, ignored by the standard Lagrange multiplier test, is that they are onesided in nature. A test that exploits this one-sided aspect is constructed based on the sum of the scores. The small-sample-size and power properties of two versions of this test under both normal and leptokurtic disturbances are investigated via a Monte Carlo experiment. The results indicate that both versions of the new test typically have superior power to two versions of the Lagrange multiplier test and possibly also more accurate asymptotic critical values. 相似文献
946.
《Journal of Statistical Computation and Simulation》2012,82(5):619-634
Testing procedures are considered for identifying the minimum effective dose (MED) in a dose–response study with randomly right-censored survival data, where the MED is defined to be the smallest dose level under study that has survival advantage over the zero dose control. The proposed testing procedures are implemented in a step-down manner together with three different types of weighted Kaplan–Meier statistics. Comparative results of a Monte Carlo error rate and power/bias study for a variety of survival and censoring distributions are then presented and discussed. The application of the proposed procedures is finally illustrated for identifying the MED of the diethylstilbestrol in the treatment of prostate cancer. 相似文献
947.
《Social Work in Mental Health》2013,11(3):35-52
Abstract Forty-seven psychiatric inpatients in a Canadian psychiatric hospital participated in an evaluation of the stability and validity of the Holden Psychological Screening Inventory (HPSI). Stability coefficients over a 1-month period were .85, .79, and .66 for the HPSI Psychiatric, Social, and Depression Symptomatology scales, respectively, and coefficient alpha reliabilities for these scales ranged between .76 and .89 across both time periods. Staff rating composite scales corresponding to the self-report HPSI scales had stability coefficients of .74, .85, and .82, respectively. As well, they had inter-rater reliabilities that ranged between .65 and .84 across both time periods. The 3 staff rating composites at time 1 correlated equivalently with the corresponding 3 primary HPSI scales at times 1 and 2 (p > .05). Similarly, the 3 staff rating composites at time 2 correlated equivalently with the corresponding 3 primary HPSI scales at times 1 and 2 (p > .05). Over a 1-month period, HPSI scale scores were very stable and correlations with criterion ratings were stable. Using a confirmatory factor analysis, with each of the 3 dimensions defined by the time 1 and 2 measures for the 3 HPSI scales and 3 staff rating composites, evidence for discriminant as well as convergent validity was obtained. In summary, the self-report HPSI and the staff rating composite measures evidenced sufficient reliability and validity to meet the requirements for routine clinical assessment work with psychiatric inpatients. Additionally, the stability data provide effects of retesting baseline data for assessing treatment outcome in this population. 相似文献
948.
Jun-mo Nam 《统计学通讯:理论与方法》2013,42(9):1053-1068
Various methods for estimating the parameters of the simple harmonic curve and corresponding statistics for testing the significance of the sinusoidal trend are investigated. The locally reasonable method is almost fully efficient when the size of the trend is very small; however, the maximum likelihood method is preferred generally, especially when the trend is not very small. The log likelihood ratio test is more powerful than the R test which is based on locally reasonable estimates. The efficient method and the log likelihood ratio or equivalent tests are the best statistical techniques for identifying the cyclical trend. Thus they are the methods of choice when adequate computing facilities are available. 相似文献
949.
In this paper new asymptotic expansions of the distributions of the sphericity test criterion are obtained in the null and the non-null case when the alternatives are close to the hypothesis. These expansions are obtained for the first time in terms of beta distributions. These appear to be better than the ones available in the literature. 相似文献
950.
Quade (1972,1979) proposed a family of nonparametric tests based on a method of weighted within-block rankings, for testing the hypothesis of no treatment effects in a complete randomized blocks layout. In this paper we obtain an expression for the Pitman asymp-totic relative efficiency of these tests with respect to the Friedman test. 相似文献