Yi-Hsin Chen

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The independent samples t-test is one of the most used tests for detecting true mean differences. The SAS system provides the PROC TTEST procedure which is an easy way to conduct a test for the difference between two population means by assuming homogeneity of variance or avoiding it. However, the t-test and its alternatives (the Satterthwaite's approximate(More)
BACKGROUND The CHADS2 and CHA2DS2 scores are usually applied for stroke prediction in atrial fibrillation patients, and the Charlson comorbidity index (CCI) is a commonly used scale for assessing morbidity. The role in assessing mortality with score system in hemodialysis is not clear and comparisons are lacking. We aimed at evaluating CHADS2, CHA2DS2, and(More)
A simulation study was devised to evaluate the accuracy and precision of the GLIMMIX procedure when fitting the dichotomous Rasch model. The evaluation reviewed technicalities including item parameter recovery, standard error estimates, unstandardized and standardized fit indices produced by GLIMMIX. Factors manipulated in this study were The generating(More)
Measures of effect size are recommended to communicate information on the strength of relationships between variables. Such information supplements the reject / fail-to-reject decision obtained in statistical hypothesis testing. The choice of an effect size for ANOVA models can be confusing because indices may differ depending on the research design as well(More)
This study provides psychometric assessment of an HIV disclosure belief scale (DBS) among men who have sex with men (MSM). This study used baseline data from a clinical trial evaluating the effectiveness of an HIV serostatus disclosure intervention of 338 HIV-positive MSM. The Rasch model was used after unidimensionality and local independence assumptions(More)
A simulation study was conducted to explore the performance of the independent means t-test, Satterthwaite's approximate t-test, and the conditional t-test under various conditions. Type I error control and statistical power of these testing approaches were examined and guidance provided on the proper selection among them.
In this paper, a CMOS multichannel transceiver (TRX) is proposed for angular identification in automotive car radar applications. Two transmitters (TXs) and six receivers (RXs) are placed on the same die using 65-nm CMOS technology with chip size 3.5 &#x00D7; 3 mm<sup>2</sup>. To generate a millimeter-wave (MMW) frequency-modulated continuous-wave signal,(More)
This study explores the possible association between the risk of ischemic stroke and conjugated equine estrogen (CEE) use in women who are over 55 years old and have diabetes. Data from the National Health Insurance system of Taiwan were used to identify 428 women over 55 years old with diabetes who used CEE (0.625 mg daily) from 2003 to 2009. For(More)