Showing 81 - 90 of 1,143
Different estimation methods for covariance parameters in meta-analyses can result in conflicting p-values concerning the test of treatment effect. We propose a valid method to overcome this problem at least partially by introducing a new estimator for the standard deviation of the common...
Persistent link: https://www.econbiz.de/10010982335
Sind in einer statistischen Analyse mehr als eine Variationsursache zu berücksichtigen_ so zerfällt die Gesamtvariation in mehrere Komponenten. Für diese sind in der Regel auch Beziehungen oder Ordnungen bekannt. Aber keine der bekannten Schätztheorien ist in der Lage, diese Ordnungen auch...
Persistent link: https://www.econbiz.de/10010982336
We describe a computer intensive method for linear dimension reduction which minimizes the classification error directly. Simulated annealing Bohachevsky et al (1986) is used to solve this problem. The classification error is determined by an exact integration. We avoid distance or scatter...
Persistent link: https://www.econbiz.de/10010982337
Persistent link: https://www.econbiz.de/10010982338
In this paper we examine two widely used methods to obtain a transformation in Taguchi experiments, namely the lambda plot and the beta technique. We consider different situations with contrasts influencing the mean and / or the variance of the response. Our simulation study reveals that the...
Persistent link: https://www.econbiz.de/10010982339
The correlated Weibull regression model for the analysis of correlated binary data is presented. This regression model is based on Bonney’s disposition model for the regression analysis of correlated binary outcomes. Parameter estimation was done through the maximum likelihood method. The...
Persistent link: https://www.econbiz.de/10010982340
This note shows that the Augmented Dickey-Fuller test is consistent against fractional alternatives if the order of the autoregression does not tend to infinity too fast.
Persistent link: https://www.econbiz.de/10010982341
Background: There are already many effective topical therapies available for use in the treatment of chronic plaque psoriasis. Unfortunately, these treatments are often associated with a not insignificant risk of undesirable effects. Objective and methods: In the randomized, prospective clinical...
Persistent link: https://www.econbiz.de/10010982342
This paper analyzes linear models. It investigates the difference between the sum of squares of the residuals and the sum of squares of the prediction errors when the parameter is estimated consecutively. In case the regressors are “fractionally integrated” (in a very broad sense) it is...
Persistent link: https://www.econbiz.de/10010982343
Mit Hilfe einer numerischen Meta-Analyse wird gezeigt, daß in placebokontrollierten klinischen Studien mit vergleichbarem Studiendesign und vergleichbarer Zielvariable die Behandlung der funktionellen Dyspepsie mit einem Gastroprokinetikum (Cisaprid) erfolgreicher ist als mit...
Persistent link: https://www.econbiz.de/10010982344