Adjusted Power Estimates
نویسنده
چکیده
Critical values and powers of competing tests are often evaluated through Monte Carlo simulations. Since the true levels of those tests are often very diierent, comparisons of the power estimates are not valid. We suggest that Monte Carlo estimates of critical values be used to create adjusted power estimates which are then comparable. The main contribution is to analyze the variability of the adjusted estimates and to point out implications for the planning of Monte Carlo power studies.
منابع مشابه
An Application of Non-response Bias Reduction Using Propensity Score Methods
In many statistical studies some units do not respond to a number or all of the questions. This situation causes a problem called non-response. Bias and variance inflation are two important consequences of non-response in surveys. Although increasing the sample size can prevented variance inflation, but cannot necessary adjust for the non-response bias. Therefore a number of methods ...
متن کاملBidding Strategy in Spot Markets with Definition of a New Market Power Index by Using Conjectural Variation
In this paper, the concept of Conjectural Variation (CV) is used to specify optimal generation decision for generation companies (Gencos). The conjecture of Genco is defined as its belief or expectation about the reaction of rivals to change of its output. Using CV method, each Genco has to learn and estimate strategic behaviors of other competitors from available historical market operation da...
متن کاملHigher moments portfolio Optimization with unequal weights based on Generalized Capital Asset pricing model with independent and identically asymmetric Power Distribution
The main criterion in investment decisions is to maximize the investors utility. Traditional capital asset pricing models cannot be used when asset returns do not follow a normal distribution. For this reason, we use capital asset pricing model with independent and identically asymmetric power distributed (CAPM-IIAPD) and capital asset pricing model with asymmetric independent and identically a...
متن کاملEstimating Covariate-Adjusted Log Hazard Ratios for Multiple Time Intervals in Clinical Trials using Nonparametric Randomization Based ANCOVA
The hazard ratio is a useful tool in randomized clinical trials for comparing time-to-event outcomes for two groups. Although better power is often achieved for assessments of the hazard ratio via model-based methods that adjust for baseline covariates, such methods make relatively strong assumptions, which can be problematic in regulatory settings that require prespecified analysis plans. This...
متن کاملImproved Estimates of Kinematic Wave Parameters for Circular Channels
The momentum equation in the kinematic wave model is a power-law equation with two parameters. These parameters, which relate the discharge to the flow area, are commonly derived using Manning’s equation. In general, the values of these parameters depend on the flow depth except for some special cross sections. In this paper, improved estimates of the kinematic wave parameters for circular chan...
متن کامل