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Showing 1 to 20 of 58 for “"Student's t"”.
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Volatility Modeling Using the Student's t Distribution
… overparameterization. This dissertation uses the Student's t distribution and follows the Probabilistic Reduction (PR) methodology to modify and extend the univariate and multivariate volatility models viewed as alternative to the GARCH models. Its most important advantage is that it gives rise to …
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Volatility Modeling and Risk Measurement using Statistical Models based on the Multivariate Student's t Distribution
… exchange rate and stock market data, we proposed Student's t Autoregressive models to estimate expected return and volatility to measure risk, using Value at Risk (VaR) and Expected Shortfall (ES). The misspecification testing analysis shows that our proposed models can adequately capture the …
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Robust Prediction of Large Spatio-Temporal Datasets
… describes a robust and efficient design of Student-t based Robust Spatio-Temporal Prediction, namely, St-RSTP, to provide estimation based on observations over spatio-temporal neighbors. It is crucial to many applications in geographical information systems, medical imaging, urban planning, …
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Psittacidae, a monograph of the parrot family
… and the Counselor Evaluating Rating Scale. The Student's t was the main statistical analysis employed to test the main hypothesis.
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An InVitro Leakage and Viscosity Analysis of Root End Filling Materials
… each material was measured and compared with the Student's t test. MTA Angelus Fluid's viscosity was significantly lower than the other two materials tested. Microleakage of root end fillings was assessed in a passive diffusion model. Leakage groups were compared with a one-way ANOVA (p < 0.05). …
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The effects of preoperative teaching on anxiety levels of hysterectomy patients
… Scores of the two groups was examined using Student's t-test (two-tailed) and ANCOVA. Analysis of data did not indicate a statistically significant difference at the.05 level of probability. However, in view of the small sample size used, further research in this important aspect of nursing, …
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A comparison of upper confidence limits for skewed distributions
… Three statistical tests will also be evaluated: Student's t-Statistic, Chebychev's Inequality, and Land's H-Statistic to compute the UCL. By modeling skewness effectively, we can determine the most appropriate distribution and statistical method to use in computing UCLs.
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Censored Regression Models With Applications to Infrastructure Degradation Studies
… of the Tobit censored regression model using Student's t distribution instead of the normal. Thus additional flexibility is achieved varying the degrees of freedom. The variance function can be estimated by using additional regression steps. Nonparametric methods are extended to apply to …
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Revisiting the CAPM and the Fama-French Multi-Factor Models: Modeling Volatility Dynamics in Financial Markets
… results in a family of heterogeneous Student's t models which are shown to account for all the statistical regularities in the data. This family of models provides an appropriate basis for revisiting the empirical adequacy of the CAPM and the Fama-French multi-factor models, as well as …
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Spontaneous Rosette Formation In Mice Immunized With Listeria Monocytogenes
… systems were determined to be significant by the Student's t test. Concanavalin A (Con A) binding studies were also performed to assess differences between lymphocyte surfaces in nonimmunized and immunized mice. It is suggested that depression of SRF in immunized mice is due to a surface …
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Reducing turnaround time in a clinical laboratory by using a management model utilizing process automation and lean healthcare
… validation of the results obtained through Student's t-test, a reduction of 12,86% of the TAT and the elimination of non-compliant products generated in the laboratory marking area is affirmed. Likewise, the project will be considered economically viable with an IRR of 67% and a B/C of 2.27. …
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A Comparison of the Behavioral Adjustment of First-Grade Students that Attended a Full-Day Kindergarten Program and First-Grade Students that Attended a Half-Day Kindergarten Program
… the behavioral adjustment of first-grade students that participated in a full-day kindergarten program and first-grade students that participated in a half-day kindergarten program. The researcher also examined gender interactions between the two groups. The study was conducted in two …
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Generalized Principal Component Analysis
… of distributions, which includes the Normal, the Student's t, the Laplace and the Pearson type II distributions as special cases. The result of these extensions is called the Generalized principal component analysis (GPCA). The GPCA is illustrated using both Monte Carlo simulations as well as an …
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Prevention of Spinal Deformities in Preschool-Age Children /// Профилактика на гръбначните изкривявания при деца в предучилищна възраст
… methods, methods of testing the hypotheses (Student's t-test, ANOVA; ?2) and correlation analysis. After application of the methods, the reduction in the frequency of the asymmetries and improvement of the functional durability in the children of EG1 were statistically significant when …
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Mahalanobis kernel-based support vector data description for detection of large shifts in mean vector
… generated from multivariate normal, multivariate Student's (t), and multivariate gamma populations using R, a popular software environment for statistical computing. One case study is also discussed using a real data set received from Halberg Chronobiology Center. Compared to Gaussian kernel, …
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A COMPARISON OF 2D IMAGE ANALYSIS AND DESIGN-BASED STEREOLOGY FOR EVALUATING MORPHOLOGICAL AND ANATOMICAL CHANGES IN THE DOPAMINERGIC SYSTEM OF THE RODENT MIDBRAIN
… number, neuronal volume and regional volume. Student's t-test (two-tailed) was used to compare quantitative data. Results. 2D analyses generated significantly different estimation form design-based stereology in neuronal number and did not find relatively small differences of neuronal number. …
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The robustness to non-normality of significance levels of the t and F tests
… made by Gayen (13), (14) and (15) showed that"Student's" t-test and the closely related F-test of analysis of variance are insensitive to departures from normality. But the F-test on the equality of two variances is very sensitive to such departures. Empirical studies made by Norton (19) and …
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Multipass effects of wheel and track type vehicles on soil compaction
… soil density were compared using the paired student's t-test and an equation was developed relating the density values obtained by nuclear and gravimetric procedures. Comparison of the data from the two methods indicated that the nuclear densitometer underestimated the core bulk density.
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Investigating the performance of process-observation-error-estimator and robust estimators in surplus production model: a simulation study
… with fat-tailed distributions including Student's t distribution and Cauchy distribution were also proposed and their performances were compared with the estimators with normal distribution. This study used Bayesian method, revised Metropolis Hastings within Gibbs sampling algorithm …
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The effect of varying levels of dietary protein on carcass composition of eleven- and eighteen-month-old male rats
… determined. Two-way analysis of variance and Student's t-tests were used to determine significant age and diet effects. Differences in the response of the two age groups of rats were evident. Eighteen-month-old rats required more protein than the younger animals for the maintenance of body …
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