Browsing Research Report by Title
Now showing items 77-96 of 130
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PARAMETRIC AND NONPARAMETRIC TESTS FOR BXOEQUIVALENCE TRIALS
(University of Gothenburg, 1986-02-01)In pharmacology, comparison of bioavailability is an important problem. A new formulation of a drug is compared with a standard formulation in human subjects. When the extent of absorption is studied the areas under the ... -
Prediction of work resumption among men and women with lower back- and neck pain in a Swedish population
(University of Gothenburg, 2002-04-01)An approach based on Bayes theorem is used to predict the binary outcome of work resumption X, where X = 1 if no work resumption and X = 0 otherwise, given a vector of discrete predictors Z for men and women with lower ... -
Prediction of work resumption in theory and practice
(University of Gothenburg, 2002-05-01)In Sweden, the number oflong-term sick-listed has increased by about 30% per year during the period 1997-2001, and the cost for health insurance is 108 billion SEK in the state budget (2002). Thus, the prediction of work ... -
Predictions by early indicators of the time and height of yearly influenza outbreaks in Sweden
(2007-12-13)Aims: Methods for prediction of the peak of the influenza from early observations are suggested. These predictions can be used for planning purposes. Methods: In this study, new robust methods are described and applied ... -
Preliminary testing in a class of simple non-linear mixed models to improve estimation accuracy
(2003-09-02)In applied research hypothetical information about the parameters in a stochastic model sometimes can be generated from theory or previous studies. Replacing unknown parameters by constants might increase the estimation ... -
Relative Efficiency of a Quantile Method for Estimating Parameters in Censored Two-Parameter Weibull Distributions
(University of Gothenburg, 2010-11-01)In simulation studies the computer time can be much reduced by using censoring. Here a simple method based on quantiles (Q method) is compared with the Maximum Likelihood (ML) method when estimating the parameters in ... -
Repeated measurement designs for models with self and mixed carryover effects
(University of Gothenburg, 1998-09-01)We study the problem of design and analysis of two-period repeated measurement (crossover or changeover) designs based on two or more treatments. In our model we allow the appearance of two types of carryovers (residuals) ... -
RESAMPLING PROCEDURES IN LINEAR MODELS
(University of Gothenburg, 1993-03-01)We will study here different resampling procedures for creating confidence sets in linear models. A special technique called abstract resampling makes it possible to use the true residuals and the true model for resampling. ... -
SATURATED DESIGNS FOR SECOND ORDER MODELS
(University of Gothenburg, 1994-09-01)Construction of saturated designs for different types of second order models are discussed. Also a comparison between two types of saturated designs for the full second order model is presented. -
Screening-related prevalence and incidence for non-recurrent diseases
(University of Gothenburg, 1997-02-01)Expressions for prevalence (P) and incidence (I) in open dynamic populations are derived. When screenings are performed every s:th year, P and I will be functions of s. It is shown how the true values of P and l, which ... -
Semiparametric estimation of outbreak regression
(2008-07-02)A regression may be constant for small values of the independent variable (for example time), but then a monotonic increase starts. Such an “outbreak” regression is of interest for example in the study of the outbreak of ... -
Semiparametric surveillance of outbreaks
(2008-07-02)The detection of a change from a constant level to a monotonically increasing (or decreasing) regression is of special interest for the detection of outbreaks of, for example, epidemics. A maximum likelihood ratio statistic ... -
SEPARATION OF SYSTEMATIC AND RANDOM ERRORS IN ORDINAL RATING SCALES
(University of Gothenburg, 1992-04-01)The aim of this paper is to introduce a new rank method which enables us to separate the inconsistency of repeated measurements into random and systematic differences and to quantify this lack of consistency in a few ... -
SEQUENTIAL ANALYSIS OF SIMPLE HYPOTHESES WHEN USING PLAY-THE-WINNER ALLOCATION
(University of Gothenburg, 1996-01-01)Play-the-winner allocations aim to place more subjects on the better treatment. The subjects enter the study sequentially. In this paper, a method for analyzing a dichotomous response, when using the randomized play-the-winner ... -
Sequential probability ratio tests when using randomized play-the-winner allocation
(University of Gothenburg, 1997-01-01)In many clinical experiments there is a conflict between ethical demands to provide the best possible medical care for the patients and the statisticians desire to obtain an efficient experiment. Play-the-winner allocations ... -
Similarities and differences between statistical surveillance and certain decision rules in finance
(2007-12-13)Financial trading rules have the aim of continuously evaluating available information in order to make timely decisions. This is also the aim of methods for statistical surveillance. Many results are available regarding ... -
Similarities and differences between statistical surveillance and certain decision rules in finance
(University of Gothenburg, 2003-04-01)this paper we consider prospective decision rules that aim at extracting early signals about what decision to make, e.g. sell an asset. The decision rules are based on prospective monitoring of a statistic in order to ... -
Simple conservative confidence intervals for comparing matched proportions
(University of Gothenburg, 2011-01-01)Unconditional confidence intervals (CIs) for the difference between marginal proportions in matched pairs data have essentially been based on improvements of Wald’s large-sample statistic. The latter are approximate and ... -
Some aspects of wavelet anal ysis in time series
(University of Gothenburg, 2000-04-01)The first paper describes an alternative approach for testing the existence of trend among time series. The test method has been constructed using wavelet analysis which have the ability to decompose a time series into low ...