We adapt the self-controlled case series method for long-term surveillance of vaccine safety using cumulative sum (CUSUM) charts. The CUSUM surveillance method we propose is applicable for detecting associations that arise in a short pre-determined risk period following vaccination. The performance of the case series CUSUM is investigated through simulations. We illustrate the method using retr...

Quality control is an important role in industry for maintain quality stability. Statistical process can quickly investigate the occurrence of unforeseen causes or shifts using charts. Mixed Exponentially Weighted Moving Average - Cumulative Sum (MEC) chart a tool used to monitor and evaluate whether production not. The MEC method combination (EWMA) (CUSUM) Combining two charts aims increase se...

We develop an empirical approximation to the null steady-state distribution of the cumulative sum (CUSUM) statistic, defined as the distribution of values obtained by running a CUSUM with no upper boundary under the null state for an indefinite period of time. The derivation is part theoretical and part empirical and the approximation is valid for CUSUMs applied to Normal data with known varian...

Access to timely, risk-adjusted measures of transplant center outcomes is crucial for program quality improvement. The cumulative summation technique (CUSUM) has been proposed as a sensitive tool to detect persistent, clinically relevant changes in transplant center performance over time. Scientific Registry of Transplant Recipients data for adult kidney and liver transplants (1/97 to 12/01) we...

PURPOSE The cumulative sum (CUSUM) is proposed and tested in a group of glaucoma patients and healthy subjects as a method for monitoring disease progression and for identifying clinically significant step changes in visual structure or function. METHODS The CUSUM procedure is the recommended method for the timely detection of small step changes in manufacturing process control. The CUSUM pro...

Distribution-free (nonparametric) control charts can be useful to the quality practitioner when the underlying distribution is not known. A Phase II nonparametric CUSUM chart based on the exceedance statistics, called the exceedance CUSUM chart, is proposed here for detecting a shift in the unknown location parameter of a continuous distribution. The exceedance statistics can be more efficient ...

BACKGROUND Flexible cystoscopy (FC) is one of the most frequently performed urological intervention. Cumulative sum analysis (CUSUM) allows objective assessment of a proceduralist's performance to ensure acceptable outcomes. This study investigated the application of CUSUM to assess a trainee's learning curve and maintenance of competence in performing FC. METHODS A single urology trainee, wi...

BACKGROUND The report of the CUSUM across surgical and interventional procedures has spawned a fair confusion in the literature. AIM To assess the use of the CUSUM and to clarify its utilisation in the perspective of future studies. Nature of the study: Retrospective review. METHODS A systematic literature search of Medline was carried out. From each article, data regarding the design of th...

Clusters of nosocomial infection often occur undetected, at substantial cost to the medical system and individual patients. We evaluated binary cumulative sum (CUSUM) and moving average (MA) control charts for automated detection of nosocomial clusters. We selected two outbreaks with genotyped strains and used resistance as inputs to the control charts. We identified design parameters for the C...