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991.
Chia-Shang James Chu 《Econometric Reviews》2013,32(3):353-360
This article presents a multiple hypothesis test procedure that combines two well known tests for structural change in the linear regression model, the CUSUM test and the recursive t test. The CUSUM test is run through the sequence of recursive residuals as usual; if the CUSUM plot does not violate the critical lines, one more step is taken to perform the t test for hypothesis of zero mean based on all recursive residuals. The asymptotic size of this multiple hypothesis test is derived; power simulation results suggest that it outperforms the traditional CUSUM test and complements other tests that are currently stressed in econometrics. 相似文献
992.
MRPP rank tests for two subgroups of unequal size are studied in detail. Based on the Pearson criteria, appropriate Pearson curves are suggested for their approximate distributions. On the basis ot extensive simulations, empirical powers of these tests are compared among themselves and with some standard nonparametric tests for several underlying populations. 相似文献
993.
994.
《Journal of Statistical Computation and Simulation》2012,82(14):2839-2859
In some industrial applications, the quality of a process or product is characterized by a relationship between the response variable and one or more independent variables which is called as profile. There are many approaches for monitoring different types of profiles in the literature. Most researchers assume that the response variable follows a normal distribution. However, this assumption may be violated in many cases. The most likely situation is when the response variable follows a distribution from generalized linear models (GLMs). For example, when the response variable is the number of defects in a certain area of a product, the observations follow Poisson distribution and ignoring this fact will cause misleading results. In this paper, three methods including a T2-based method, likelihood ratio test (LRT) method and F method are developed and modified in order to be applied in monitoring GLM regression profiles in Phase I. The performance of the proposed methods is analysed and compared for the special case that the response variable follows Poisson distribution. A simulation study is done regarding the probability of the signal criterion. Results show that the LRT method performs better than two other methods and the F method performs better than the T2-based method in detecting either small or large step shifts as well as drifts. Moreover, the F method performs better than the other two methods, and the LRT method performs poor in comparison with the F and T2-based methods in detecting outliers. A real case, in which the size and number of agglomerates ejected from a volcano in successive days form the GLM profile, is illustrated and the proposed methods are applied to determine whether the number of agglomerates of each size is under statistical control or not. Results showed that the proposed methods could handle the mentioned situation and distinguish the out-of-control conditions. 相似文献
995.
Simulated powers of the MRPP two-sample rank test statistic ?1- are compared with the powers of the MRPP test statistic ?2(the two-sided Wilcoxon-Mann-Whitney test) for large samples from several underlying populations. Powers are obtained using two approximate distributions of ?1 involving three and four moments respectively, The use of the fourth moment indicates that an approximation to the null distribution of ? based on four moments can perform better 相似文献
996.
《The aging male》2013,16(4):95-99
Background.?It is well documented that testosterone levels decline with age, this decline is associated with symptoms which could be assessed denoting androgen deficiency. We investigated the validity of an Arabic version of the Saint Louis University androgen deficiency in ageing men (ADAM) questionnaire to screen for androgen deficiency in Saudi and non Saudi Arabic speaking men.Methods.?It was a cross sectional study of ambulatory community-based Arabic Saudi men recruited from Volunteers in Riyadh city, Capital of Saudi Arabia, aged 18–80 years. Seven hundred thirty men agreed to fill the Arabic ADAM questionnaire, they were invited to a morning blood sample for total testosterone and sex hormone binding globulin and those who agreed to complete the whole study were only 407 men. Low serum bioavailable testosterone (BT) levels (androgen deficiency) were defined as <10th percentile of serum BT levels in young healthy Saudi men (18–30 years).Results.?Cronbach's Alpha of 0.71 (n?=?730) showed a good internal consistency of the Arabic ADAM questionnaire. Among participants, 18.2% and 77.6% had low serum BT levels and a positive ADAM questionnaire, respectively. The prevalence of positive ADAM and low serum BT is increasing with age. The Arabic ADAM questionnaire had a high sensitivity of 86.5%, a low specificity of 24.3%, and positive predictive values (+PVs) and negative (?PVs) of 20.3% and 89%, respectively.Conclusion.?The Arabic ADAM questionnaire has a very good sensitivity but very low specificity for screening of androgen deficiency in Saudi men, therefore biological confirmation is needed especially when clinical symptoms of androgen deficiency are present. 相似文献
997.
Goodness-of-fit tests for the family of the four-parameter normal–variance gamma distribution are constructed. The tests are based on a weighted integral incorporating the empirical characteristic function of suitably standardized data. Non-standard algorithms are employed for the computation of the maximum-likelihood estimators of the parameters involved in the test statistic, while Monte Carlo results are used in order to compare the new test with some classical goodness-of-fit methods. A real-data application is also included. 相似文献
998.
999.
Jeyaraj Vadiveloo 《统计学通讯:理论与方法》2013,42(14):1581-1596
A general randomization test for nonparametric hypotheses which is a modification of permutation tests in proposed. The exact level of the test is derived and under mild gegularity conditions, a general result on the consistency of the power function is obtained. Applications to several testing problems are considered. Asymptotic expansions of the power of this test are derived with respect to contiguous alternatives thus test are derived with respect to contiguous alternatives thus enabling us to make deficiency comparisons with permutation tests. The paper concludes with some Monte Carlo simulations verifying the theoretical results derived. 相似文献
1000.
This paper provides Bartlett corrections to improve likelihood ratio tests for heteroskedastic normal linear models when the error covariance matrix is nonscaiar and depends on a set of unknown parameters. The Bartlett corrections are simple enough to be used algebraically to obtain several closed-form expressions in special cases. The corrections have also advantages for numerical purposes because they involve only simple operations on matrices and vectors. 相似文献