the main concern of this study was communication strategies (css) which are used to compensate for communication breakdown. the goals of this study were to examine whether proficiency level of iranian students had any relationship with their choice of css. this research was descriptive in nature. the participants were 15 pre-intermediate and 14 intermediate efl learners between 16 to 21years ol...

Multivariate control charts such as Hotelling`s T^ 2 and X^ 2 are commonly used for monitoring several related quality characteristics. These control charts use correlation structure that exists between quality characteristics in an attempt to improve monitoring. The purpose of this article is to discuss some issues related to the G chart proposed by Levinson et al. [9] for detecting shifts in ...

The standard max chart gives an out-of-control signal when the chart's statistic M exceeds the upper control limit UCL. The probability of M falling below the UCL is given as [3] 2 2 2) UCL (2 2 2) UCL (2 1 2 1 UCL UCL δ χ δ χ δ δ δ δ H H n n , where UCL > 0,) (⋅ Φ is the cumulative distribution function of a standard normal random variable,) (⋅ H is the cumulative distribution function of a ch...

OBJECTIVE To evaluate the accuracy of pediatric patients' death records of a tertiary care center, comparing these records with data from a previous study. METHODS Death records entered on the medical charts of non-resuscitated patients between 1999 and 2001 were compared with the medical procedure during cardiac arrest, which was described based on the Utstein-style guidelines. Our results w...

This study integrates production and maintenance planning with statistical process monitoring in the presence of dependent multiple assignable causes. To adapt model to reality, two assumptions are considered: (1) causes (ACs) dependent, (2) occurrence ACs can affect both mean variability. Given second assumption, a non-central chi-square (NCS) chart is used monitor process. Since rate increase...

Owen (1988) showed that the non-parametric empirical likelihood ratio under a linear constrain has an asymptotic chi-square distribution, same as in the paramet-ric case. This fact can be used to form (non-parametric, asymptotic) conndence intervals. We suggest here to use the non-parametric version of the Pearson's chi-square statistic instead of the likelihood ratio to form conndence interval...

This note proposes a new chi-square approximation to the distribution of non-negative definite quadratic forms in non-central normal variables. The unknown parameters are determined by the first four cumulants of the quadratic forms. The proposed method is compared with Pearson’s three-moment central χ2 approximation approach, by means of numerical examples. Our method yields a better approxima...

In this correspondence, we point out two typographical errors in Chai and Tjhung’s paper and we offer the correct formula of the unified Laguerre polynomial-seriesbased cumulative distribution function (cdf) for small-scale fading distributions. A Laguerre polynomial-series-based cdf formula for non-central chi-square distribution is also provided as a special case of our unified cdf result.